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• How to Write a Literature Review | Guide, Examples, & Templates

How to Write a Literature Review | Guide, Examples, & Templates

Published on January 2, 2023 by Shona McCombes . Revised on September 11, 2023.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research that you can later apply to your paper, thesis, or dissertation topic .

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates, and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarize sources—it analyzes, synthesizes , and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

What is the purpose of a literature review, examples of literature reviews, step 1 – search for relevant literature, step 2 – evaluate and select sources, step 3 – identify themes, debates, and gaps, step 4 – outline your literature review’s structure, step 5 – write your literature review, free lecture slides, other interesting articles, frequently asked questions, introduction.

• Quick Run-through
• Step 1 & 2

When you write a thesis , dissertation , or research paper , you will likely have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and its scholarly context
• Develop a theoretical framework and methodology for your research
• Position your work in relation to other researchers and theorists
• Show how your research addresses a gap or contributes to a debate
• Evaluate the current state of research and demonstrate your knowledge of the scholarly debates around your topic.

Writing literature reviews is a particularly important skill if you want to apply for graduate school or pursue a career in research. We’ve written a step-by-step guide that you can follow below.

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research problem and questions .

Make a list of keywords

Start by creating a list of keywords related to your research question. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list as you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some useful databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can also use boolean operators to help narrow down your search.

Make sure to read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

You likely won’t be able to read absolutely everything that has been written on your topic, so it will be necessary to evaluate which sources are most relevant to your research question.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models, and methods?
• Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible , and make sure you read any landmark studies and major theories in your field of research.

You can use our template to summarize and evaluate sources you’re thinking about using. Click on either button below to download.

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It is important to keep track of your sources with citations to avoid plagiarism . It can be helpful to make an annotated bibliography , where you compile full citation information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

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To begin organizing your literature review’s argument and structure, be sure you understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly visual platforms like Instagram and Snapchat—this is a gap that you could address in your own research.

There are various approaches to organizing the body of a literature review. Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarizing sources in order.

Try to analyze patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organize your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text , your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, you can follow these tips:

• Summarize and synthesize: give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: don’t just paraphrase other researchers — add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically evaluate: mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: use transition words and topic sentences to draw connections, comparisons and contrasts

In the conclusion, you should summarize the key findings you have taken from the literature and emphasize their significance.

When you’ve finished writing and revising your literature review, don’t forget to proofread thoroughly before submitting. Not a language expert? Check out Scribbr’s professional proofreading services !

This article has been adapted into lecture slides that you can use to teach your students about writing a literature review.

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If you want to know more about the research process , methodology , research bias , or statistics , make sure to check out some of our other articles with explanations and examples.

• Sampling methods
• Simple random sampling
• Stratified sampling
• Cluster sampling
• Likert scales
• Reproducibility

 Statistics

• Null hypothesis
• Statistical power
• Probability distribution
• Effect size
• Poisson distribution

Research bias

• Optimism bias
• Cognitive bias
• Implicit bias
• Hawthorne effect
• Anchoring bias
• Explicit bias

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a thesis, dissertation , or research paper , in order to situate your work in relation to existing knowledge.

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarize yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your thesis or dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

A literature review is a survey of credible sources on a topic, often used in dissertations , theses, and research papers . Literature reviews give an overview of knowledge on a subject, helping you identify relevant theories and methods, as well as gaps in existing research. Literature reviews are set up similarly to other  academic texts , with an introduction , a main body, and a conclusion .

An  annotated bibliography is a list of  source references that has a short description (called an annotation ) for each of the sources. It is often assigned as part of the research process for a  paper .  

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A literature review is a document or section of a document that collects key sources on a topic and discusses those sources in conversation with each other (also called synthesis ). The lit review is an important genre in many disciplines, not just literature (i.e., the study of works of literature such as novels and plays). When we say “literature review” or refer to “the literature,” we are talking about the research ( scholarship ) in a given field. You will often see the terms “the research,” “the scholarship,” and “the literature” used mostly interchangeably.

Where, when, and why would I write a lit review?

There are a number of different situations where you might write a literature review, each with slightly different expectations; different disciplines, too, have field-specific expectations for what a literature review is and does. For instance, in the humanities, authors might include more overt argumentation and interpretation of source material in their literature reviews, whereas in the sciences, authors are more likely to report study designs and results in their literature reviews; these differences reflect these disciplines’ purposes and conventions in scholarship. You should always look at examples from your own discipline and talk to professors or mentors in your field to be sure you understand your discipline’s conventions, for literature reviews as well as for any other genre.

A literature review can be a part of a research paper or scholarly article, usually falling after the introduction and before the research methods sections. In these cases, the lit review just needs to cover scholarship that is important to the issue you are writing about; sometimes it will also cover key sources that informed your research methodology.

Lit reviews can also be standalone pieces, either as assignments in a class or as publications. In a class, a lit review may be assigned to help students familiarize themselves with a topic and with scholarship in their field, get an idea of the other researchers working on the topic they’re interested in, find gaps in existing research in order to propose new projects, and/or develop a theoretical framework and methodology for later research. As a publication, a lit review usually is meant to help make other scholars’ lives easier by collecting and summarizing, synthesizing, and analyzing existing research on a topic. This can be especially helpful for students or scholars getting into a new research area, or for directing an entire community of scholars toward questions that have not yet been answered.

What are the parts of a lit review?

Most lit reviews use a basic introduction-body-conclusion structure; if your lit review is part of a larger paper, the introduction and conclusion pieces may be just a few sentences while you focus most of your attention on the body. If your lit review is a standalone piece, the introduction and conclusion take up more space and give you a place to discuss your goals, research methods, and conclusions separately from where you discuss the literature itself.

Introduction:

• An introductory paragraph that explains what your working topic and thesis is
• A forecast of key topics or texts that will appear in the review
• Potentially, a description of how you found sources and how you analyzed them for inclusion and discussion in the review (more often found in published, standalone literature reviews than in lit review sections in an article or research paper)
• Summarize and synthesize: Give an overview of the main points of each source and combine them into a coherent whole
• Analyze and interpret: Don’t just paraphrase other researchers – add your own interpretations where possible, discussing the significance of findings in relation to the literature as a whole
• Critically Evaluate: Mention the strengths and weaknesses of your sources
• Write in well-structured paragraphs: Use transition words and topic sentence to draw connections, comparisons, and contrasts.

Conclusion:

• Summarize the key findings you have taken from the literature and emphasize their significance
• Connect it back to your primary research question

How should I organize my lit review?

Lit reviews can take many different organizational patterns depending on what you are trying to accomplish with the review. Here are some examples:

• Chronological : The simplest approach is to trace the development of the topic over time, which helps familiarize the audience with the topic (for instance if you are introducing something that is not commonly known in your field). If you choose this strategy, be careful to avoid simply listing and summarizing sources in order. Try to analyze the patterns, turning points, and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred (as mentioned previously, this may not be appropriate in your discipline — check with a teacher or mentor if you’re unsure).
• Thematic : If you have found some recurring central themes that you will continue working with throughout your piece, you can organize your literature review into subsections that address different aspects of the topic. For example, if you are reviewing literature about women and religion, key themes can include the role of women in churches and the religious attitude towards women.
• Qualitative versus quantitative research
• Empirical versus theoretical scholarship
• Divide the research by sociological, historical, or cultural sources
• Theoretical : In many humanities articles, the literature review is the foundation for the theoretical framework. You can use it to discuss various theories, models, and definitions of key concepts. You can argue for the relevance of a specific theoretical approach or combine various theorical concepts to create a framework for your research.

What are some strategies or tips I can use while writing my lit review?

Any lit review is only as good as the research it discusses; make sure your sources are well-chosen and your research is thorough. Don’t be afraid to do more research if you discover a new thread as you’re writing. More info on the research process is available in our "Conducting Research" resources .

As you’re doing your research, create an annotated bibliography ( see our page on the this type of document ). Much of the information used in an annotated bibliography can be used also in a literature review, so you’ll be not only partially drafting your lit review as you research, but also developing your sense of the larger conversation going on among scholars, professionals, and any other stakeholders in your topic.

Usually you will need to synthesize research rather than just summarizing it. This means drawing connections between sources to create a picture of the scholarly conversation on a topic over time. Many student writers struggle to synthesize because they feel they don’t have anything to add to the scholars they are citing; here are some strategies to help you:

• It often helps to remember that the point of these kinds of syntheses is to show your readers how you understand your research, to help them read the rest of your paper.
• Writing teachers often say synthesis is like hosting a dinner party: imagine all your sources are together in a room, discussing your topic. What are they saying to each other?
• Look at the in-text citations in each paragraph. Are you citing just one source for each paragraph? This usually indicates summary only. When you have multiple sources cited in a paragraph, you are more likely to be synthesizing them (not always, but often
• Read more about synthesis here.

The most interesting literature reviews are often written as arguments (again, as mentioned at the beginning of the page, this is discipline-specific and doesn’t work for all situations). Often, the literature review is where you can establish your research as filling a particular gap or as relevant in a particular way. You have some chance to do this in your introduction in an article, but the literature review section gives a more extended opportunity to establish the conversation in the way you would like your readers to see it. You can choose the intellectual lineage you would like to be part of and whose definitions matter most to your thinking (mostly humanities-specific, but this goes for sciences as well). In addressing these points, you argue for your place in the conversation, which tends to make the lit review more compelling than a simple reporting of other sources.

• UConn Library
• Literature Review: The What, Why and How-to Guide
• Introduction

Literature Review: The What, Why and How-to Guide — Introduction

• Getting Started
• How to Pick a Topic
• Strategies to Find Sources
• Evaluating Sources & Lit. Reviews
• Tips for Writing Literature Reviews
• Writing Literature Review: Useful Sites
• Citation Resources
• Other Academic Writings

What are Literature Reviews?

So, what is a literature review? "A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available, or a set of summaries." Taylor, D.  The literature review: A few tips on conducting it . University of Toronto Health Sciences Writing Centre.

Goals of Literature Reviews

What are the goals of creating a Literature Review?  A literature could be written to accomplish different aims:

• To develop a theory or evaluate an existing theory
• To summarize the historical or existing state of a research topic
• Identify a problem in a field of research 

Baumeister, R. F., & Leary, M. R. (1997). Writing narrative literature reviews .  Review of General Psychology , 1 (3), 311-320.

What kinds of sources require a Literature Review?

• A research paper assigned in a course
• A thesis or dissertation
• A grant proposal
• An article intended for publication in a journal

All these instances require you to collect what has been written about your research topic so that you can demonstrate how your own research sheds new light on the topic.

Types of Literature Reviews

What kinds of literature reviews are written?

Narrative review: The purpose of this type of review is to describe the current state of the research on a specific topic/research and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weakness, and gaps are identified. The review ends with a conclusion section which summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.

• Example : Predictors and Outcomes of U.S. Quality Maternity Leave: A Review and Conceptual Framework:  10.1177/08948453211037398  

Systematic review : "The authors of a systematic review use a specific procedure to search the research literature, select the studies to include in their review, and critically evaluate the studies they find." (p. 139). Nelson, L. K. (2013). Research in Communication Sciences and Disorders . Plural Publishing.

• Example : The effect of leave policies on increasing fertility: a systematic review:  10.1057/s41599-022-01270-w

Meta-analysis : "Meta-analysis is a method of reviewing research findings in a quantitative fashion by transforming the data from individual studies into what is called an effect size and then pooling and analyzing this information. The basic goal in meta-analysis is to explain why different outcomes have occurred in different studies." (p. 197). Roberts, M. C., & Ilardi, S. S. (2003). Handbook of Research Methods in Clinical Psychology . Blackwell Publishing.

• Example : Employment Instability and Fertility in Europe: A Meta-Analysis:  10.1215/00703370-9164737

Meta-synthesis : "Qualitative meta-synthesis is a type of qualitative study that uses as data the findings from other qualitative studies linked by the same or related topic." (p.312). Zimmer, L. (2006). Qualitative meta-synthesis: A question of dialoguing with texts .  Journal of Advanced Nursing , 53 (3), 311-318.

• Example : Women’s perspectives on career successes and barriers: A qualitative meta-synthesis:  10.1177/05390184221113735

Literature Reviews in the Health Sciences

• UConn Health subject guide on systematic reviews Explanation of the different review types used in health sciences literature as well as tools to help you find the right review type
• << Previous: Getting Started
• Next: How to Pick a Topic >>
• Last Updated: Sep 21, 2022 2:16 PM
• URL: https://guides.lib.uconn.edu/literaturereview

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• Knowledge Base
• Dissertation
• What is a Literature Review? | Guide, Template, & Examples

What is a Literature Review? | Guide, Template, & Examples

Published on 22 February 2022 by Shona McCombes . Revised on 7 June 2022.

What is a literature review? A literature review is a survey of scholarly sources on a specific topic. It provides an overview of current knowledge, allowing you to identify relevant theories, methods, and gaps in the existing research.

There are five key steps to writing a literature review:

• Search for relevant literature
• Evaluate sources
• Identify themes, debates and gaps
• Outline the structure
• Write your literature review

A good literature review doesn’t just summarise sources – it analyses, synthesises, and critically evaluates to give a clear picture of the state of knowledge on the subject.

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Table of contents

Why write a literature review, examples of literature reviews, step 1: search for relevant literature, step 2: evaluate and select sources, step 3: identify themes, debates and gaps, step 4: outline your literature review’s structure, step 5: write your literature review, frequently asked questions about literature reviews, introduction.

• Quick Run-through
• Step 1 & 2

When you write a dissertation or thesis, you will have to conduct a literature review to situate your research within existing knowledge. The literature review gives you a chance to:

• Demonstrate your familiarity with the topic and scholarly context
• Develop a theoretical framework and methodology for your research
• Position yourself in relation to other researchers and theorists
• Show how your dissertation addresses a gap or contributes to a debate

You might also have to write a literature review as a stand-alone assignment. In this case, the purpose is to evaluate the current state of research and demonstrate your knowledge of scholarly debates around a topic.

The content will look slightly different in each case, but the process of conducting a literature review follows the same steps. We’ve written a step-by-step guide that you can follow below.

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Writing literature reviews can be quite challenging! A good starting point could be to look at some examples, depending on what kind of literature review you’d like to write.

• Example literature review #1: “Why Do People Migrate? A Review of the Theoretical Literature” ( Theoretical literature review about the development of economic migration theory from the 1950s to today.)
• Example literature review #2: “Literature review as a research methodology: An overview and guidelines” ( Methodological literature review about interdisciplinary knowledge acquisition and production.)
• Example literature review #3: “The Use of Technology in English Language Learning: A Literature Review” ( Thematic literature review about the effects of technology on language acquisition.)
• Example literature review #4: “Learners’ Listening Comprehension Difficulties in English Language Learning: A Literature Review” ( Chronological literature review about how the concept of listening skills has changed over time.)

You can also check out our templates with literature review examples and sample outlines at the links below.

Download Word doc Download Google doc

Before you begin searching for literature, you need a clearly defined topic .

If you are writing the literature review section of a dissertation or research paper, you will search for literature related to your research objectives and questions .

If you are writing a literature review as a stand-alone assignment, you will have to choose a focus and develop a central question to direct your search. Unlike a dissertation research question, this question has to be answerable without collecting original data. You should be able to answer it based only on a review of existing publications.

Make a list of keywords

Start by creating a list of keywords related to your research topic. Include each of the key concepts or variables you’re interested in, and list any synonyms and related terms. You can add to this list if you discover new keywords in the process of your literature search.

• Social media, Facebook, Instagram, Twitter, Snapchat, TikTok
• Body image, self-perception, self-esteem, mental health
• Generation Z, teenagers, adolescents, youth

Search for relevant sources

Use your keywords to begin searching for sources. Some databases to search for journals and articles include:

• Your university’s library catalogue
• Google Scholar
• Project Muse (humanities and social sciences)
• Medline (life sciences and biomedicine)
• EconLit (economics)
• Inspec (physics, engineering and computer science)

You can use boolean operators to help narrow down your search:

Read the abstract to find out whether an article is relevant to your question. When you find a useful book or article, you can check the bibliography to find other relevant sources.

To identify the most important publications on your topic, take note of recurring citations. If the same authors, books or articles keep appearing in your reading, make sure to seek them out.

You probably won’t be able to read absolutely everything that has been written on the topic – you’ll have to evaluate which sources are most relevant to your questions.

For each publication, ask yourself:

• What question or problem is the author addressing?
• What are the key concepts and how are they defined?
• What are the key theories, models and methods? Does the research use established frameworks or take an innovative approach?
• What are the results and conclusions of the study?
• How does the publication relate to other literature in the field? Does it confirm, add to, or challenge established knowledge?
• How does the publication contribute to your understanding of the topic? What are its key insights and arguments?
• What are the strengths and weaknesses of the research?

Make sure the sources you use are credible, and make sure you read any landmark studies and major theories in your field of research.

You can find out how many times an article has been cited on Google Scholar – a high citation count means the article has been influential in the field, and should certainly be included in your literature review.

The scope of your review will depend on your topic and discipline: in the sciences you usually only review recent literature, but in the humanities you might take a long historical perspective (for example, to trace how a concept has changed in meaning over time).

Remember that you can use our template to summarise and evaluate sources you’re thinking about using!

Take notes and cite your sources

As you read, you should also begin the writing process. Take notes that you can later incorporate into the text of your literature review.

It’s important to keep track of your sources with references to avoid plagiarism . It can be helpful to make an annotated bibliography, where you compile full reference information and write a paragraph of summary and analysis for each source. This helps you remember what you read and saves time later in the process.

You can use our free APA Reference Generator for quick, correct, consistent citations.

Prevent plagiarism, run a free check.

To begin organising your literature review’s argument and structure, you need to understand the connections and relationships between the sources you’ve read. Based on your reading and notes, you can look for:

• Trends and patterns (in theory, method or results): do certain approaches become more or less popular over time?
• Themes: what questions or concepts recur across the literature?
• Debates, conflicts and contradictions: where do sources disagree?
• Pivotal publications: are there any influential theories or studies that changed the direction of the field?
• Gaps: what is missing from the literature? Are there weaknesses that need to be addressed?

This step will help you work out the structure of your literature review and (if applicable) show how your own research will contribute to existing knowledge.

• Most research has focused on young women.
• There is an increasing interest in the visual aspects of social media.
• But there is still a lack of robust research on highly-visual platforms like Instagram and Snapchat – this is a gap that you could address in your own research.

There are various approaches to organising the body of a literature review. You should have a rough idea of your strategy before you start writing.

Depending on the length of your literature review, you can combine several of these strategies (for example, your overall structure might be thematic, but each theme is discussed chronologically).

Chronological

The simplest approach is to trace the development of the topic over time. However, if you choose this strategy, be careful to avoid simply listing and summarising sources in order.

Try to analyse patterns, turning points and key debates that have shaped the direction of the field. Give your interpretation of how and why certain developments occurred.

If you have found some recurring central themes, you can organise your literature review into subsections that address different aspects of the topic.

For example, if you are reviewing literature about inequalities in migrant health outcomes, key themes might include healthcare policy, language barriers, cultural attitudes, legal status, and economic access.

Methodological

If you draw your sources from different disciplines or fields that use a variety of research methods , you might want to compare the results and conclusions that emerge from different approaches. For example:

• Look at what results have emerged in qualitative versus quantitative research
• Discuss how the topic has been approached by empirical versus theoretical scholarship
• Divide the literature into sociological, historical, and cultural sources

Theoretical

A literature review is often the foundation for a theoretical framework . You can use it to discuss various theories, models, and definitions of key concepts.

You might argue for the relevance of a specific theoretical approach, or combine various theoretical concepts to create a framework for your research.

Like any other academic text, your literature review should have an introduction , a main body, and a conclusion . What you include in each depends on the objective of your literature review.

The introduction should clearly establish the focus and purpose of the literature review.

If you are writing the literature review as part of your dissertation or thesis, reiterate your central problem or research question and give a brief summary of the scholarly context. You can emphasise the timeliness of the topic (“many recent studies have focused on the problem of x”) or highlight a gap in the literature (“while there has been much research on x, few researchers have taken y into consideration”).

Depending on the length of your literature review, you might want to divide the body into subsections. You can use a subheading for each theme, time period, or methodological approach.

As you write, make sure to follow these tips:

• Summarise and synthesise: give an overview of the main points of each source and combine them into a coherent whole.
• Analyse and interpret: don’t just paraphrase other researchers – add your own interpretations, discussing the significance of findings in relation to the literature as a whole.
• Critically evaluate: mention the strengths and weaknesses of your sources.
• Write in well-structured paragraphs: use transitions and topic sentences to draw connections, comparisons and contrasts.

In the conclusion, you should summarise the key findings you have taken from the literature and emphasise their significance.

If the literature review is part of your dissertation or thesis, reiterate how your research addresses gaps and contributes new knowledge, or discuss how you have drawn on existing theories and methods to build a framework for your research. This can lead directly into your methodology section.

A literature review is a survey of scholarly sources (such as books, journal articles, and theses) related to a specific topic or research question .

It is often written as part of a dissertation , thesis, research paper , or proposal .

There are several reasons to conduct a literature review at the beginning of a research project:

• To familiarise yourself with the current state of knowledge on your topic
• To ensure that you’re not just repeating what others have already done
• To identify gaps in knowledge and unresolved problems that your research can address
• To develop your theoretical framework and methodology
• To provide an overview of the key findings and debates on the topic

Writing the literature review shows your reader how your work relates to existing research and what new insights it will contribute.

The literature review usually comes near the beginning of your  dissertation . After the introduction , it grounds your research in a scholarly field and leads directly to your theoretical framework or methodology .

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Methodological Approaches to Literature Review

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The literature review can serve various functions in the contexts of education and research. It aids in identifying knowledge gaps, informing research methodology, and developing a theoretical framework during the planning stages of a research study or project, as well as reporting of review findings in the context of the existing literature. This chapter discusses the methodological approaches to conducting a literature review and offers an overview of different types of reviews. There are various types of reviews, including narrative reviews, scoping reviews, and systematic reviews with reporting strategies such as meta-analysis and meta-synthesis. Review authors should consider the scope of the literature review when selecting a type and method. Being focused is essential for a successful review; however, this must be balanced against the relevance of the review to a broad audience.

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Systematic Reviews in Educational Research: Methodology, Perspectives and Application

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Thomas, D., Zairina, E., George, J. (2023). Methodological Approaches to Literature Review. In: Encyclopedia of Evidence in Pharmaceutical Public Health and Health Services Research in Pharmacy. Springer, Cham. https://doi.org/10.1007/978-3-030-50247-8_57-1

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How to write a superb literature review

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Literature reviews are important resources for scientists. They provide historical context for a field while offering opinions on its future trajectory. Creating them can provide inspiration for one’s own research, as well as some practice in writing. But few scientists are trained in how to write a review — or in what constitutes an excellent one. Even picking the appropriate software to use can be an involved decision (see ‘Tools and techniques’). So Nature asked editors and working scientists with well-cited reviews for their tips.

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A literature review is a discussion of the literature (aka. the "research" or "scholarship") surrounding a certain topic. A good literature review doesn't simply summarize the existing material, but provides thoughtful synthesis and analysis. The purpose of a literature review is to orient your own work within an existing body of knowledge. A literature review may be written as a standalone piece or be included in a larger body of work.

You can read more about literature reviews, what they entail, and how to write one, using the resources below. 

Am I the only one struggling to write a literature review?

Dr. Zina O'Leary explains the misconceptions and struggles students often have with writing a literature review. She also provides step-by-step guidance on writing a persuasive literature review.

An Introduction to Literature Reviews

Dr. Eric Jensen, Professor of Sociology at the University of Warwick, and Dr. Charles Laurie, Director of Research at Verisk Maplecroft, explain how to write a literature review, and why researchers need to do so. Literature reviews can be stand-alone research or part of a larger project. They communicate the state of academic knowledge on a given topic, specifically detailing what is still unknown.

This is the first video in a whole series about literature reviews. You can find the rest of the series in our SAGE database, Research Methods:

Videos covering research methods and statistics

Identify Themes and Gaps in Literature (with real examples) | Scribbr

Finding connections between sources is key to organizing the arguments and structure of a good literature review. In this video, you'll learn how to identify themes, debates, and gaps between sources, using examples from real papers.

4 Tips for Writing a Literature Review's Intro, Body, and Conclusion | Scribbr

While each review will be unique in its structure--based on both the existing body of both literature and the overall goals of your own paper, dissertation, or research--this video from Scribbr does a good job simplifying the goals of writing a literature review for those who are new to the process. In this video, you’ll learn what to include in each section, as well as 4 tips for the main body illustrated with an example.

• Literature Review This chapter in SAGE's Encyclopedia of Research Design describes the types of literature reviews and scientific standards for conducting literature reviews.
• UNC Writing Center: Literature Reviews This handout from the Writing Center at UNC will explain what literature reviews are and offer insights into the form and construction of literature reviews in the humanities, social sciences, and sciences.
• Purdue OWL: Writing a Literature Review The overview of literature reviews comes from Purdue's Online Writing Lab. It explains the basic why, what, and how of writing a literature review.

Organizational Tools for Literature Reviews

One of the most daunting aspects of writing a literature review is organizing your research. There are a variety of strategies that you can use to help you in this task. We've highlighted just a few ways writers keep track of all that information! You can use a combination of these tools or come up with your own organizational process. The key is choosing something that works with your own learning style.

Citation Managers

Citation managers are great tools, in general, for organizing research, but can be especially helpful when writing a literature review. You can keep all of your research in one place, take notes, and organize your materials into different folders or categories. Read more about citations managers here:

• Manage Citations & Sources

Concept Mapping

Some writers use concept mapping (sometimes called flow or bubble charts or "mind maps") to help them visualize the ways in which the research they found connects.

There is no right or wrong way to make a concept map. There are a variety of online tools that can help you create a concept map or you can simply put pen to paper. To read more about concept mapping, take a look at the following help guides:

• Using Concept Maps From Williams College's guide, Literature Review: A Self-guided Tutorial

Synthesis Matrix

A synthesis matrix is is a chart you can use to help you organize your research into thematic categories. By organizing your research into a matrix, like the examples below, can help you visualize the ways in which your sources connect. 

• Walden University Writing Center: Literature Review Matrix Find a variety of literature review matrix examples and templates from Walden University.
• Writing A Literature Review and Using a Synthesis Matrix An example synthesis matrix created by NC State University Writing and Speaking Tutorial Service Tutors. If you would like a copy of this synthesis matrix in a different format, like a Word document, please ask a librarian. CC-BY-SA 3.0
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How-to conduct a systematic literature review: A quick guide for computer science research

Angela carrera-rivera.

a Faculty of Engineering, Mondragon University

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Performing a literature review is a critical first step in research to understanding the state-of-the-art and identifying gaps and challenges in the field. A systematic literature review is a method which sets out a series of steps to methodically organize the review. In this paper, we present a guide designed for researchers and in particular early-stage researchers in the computer-science field. The contribution of the article is the following:

• • Clearly defined strategies to follow for a systematic literature review in computer science research, and
• • Algorithmic method to tackle a systematic literature review.

Graphical abstract

Specifications table

Method details

A Systematic Literature Review (SLR) is a research methodology to collect, identify, and critically analyze the available research studies (e.g., articles, conference proceedings, books, dissertations) through a systematic procedure [12] . An SLR updates the reader with current literature about a subject [6] . The goal is to review critical points of current knowledge on a topic about research questions to suggest areas for further examination [5] . Defining an “Initial Idea” or interest in a subject to be studied is the first step before starting the SLR. An early search of the relevant literature can help determine whether the topic is too broad to adequately cover in the time frame and whether it is necessary to narrow the focus. Reading some articles can assist in setting the direction for a formal review., and formulating a potential research question (e.g., how is semantics involved in Industry 4.0?) can further facilitate this process. Once the focus has been established, an SLR can be undertaken to find more specific studies related to the variables in this question. Although there are multiple approaches for performing an SLR ( [5] , [26] , [27] ), this work aims to provide a step-by-step and practical guide while citing useful examples for computer-science research. The methodology presented in this paper comprises two main phases: “Planning” described in section 2, and “Conducting” described in section 3, following the depiction of the graphical abstract.

Defining the protocol is the first step of an SLR since it describes the procedures involved in the review and acts as a log of the activities to be performed. Obtaining opinions from peers while developing the protocol, is encouraged to ensure the review's consistency and validity, and helps identify when modifications are necessary [20] . One final goal of the protocol is to ensure the replicability of the review.

Define PICOC and synonyms

The PICOC (Population, Intervention, Comparison, Outcome, and Context) criteria break down the SLR's objectives into searchable keywords and help formulate research questions [ 27 ]. PICOC is widely used in the medical and social sciences fields to encourage researchers to consider the components of the research questions [14] . Kitchenham & Charters [6] compiled the list of PICOC elements and their corresponding terms in computer science, as presented in Table 1 , which includes keywords derived from the PICOC elements. From that point on, it is essential to think of synonyms or “alike” terms that later can be used for building queries in the selected digital libraries. For instance, the keyword “context awareness” can also be linked to “context-aware”.

Planning Step 1 “Defining PICOC keywords and synonyms”.

Formulate research questions

Clearly defined research question(s) are the key elements which set the focus for study identification and data extraction [21] . These questions are formulated based on the PICOC criteria as presented in the example in Table 2 (PICOC keywords are underlined).

Research questions examples.

Select digital library sources

The validity of a study will depend on the proper selection of a database since it must adequately cover the area under investigation [19] . The Web of Science (WoS) is an international and multidisciplinary tool for accessing literature in science, technology, biomedicine, and other disciplines. Scopus is a database that today indexes 40,562 peer-reviewed journals, compared to 24,831 for WoS. Thus, Scopus is currently the largest existing multidisciplinary database. However, it may also be necessary to include sources relevant to computer science, such as EI Compendex, IEEE Xplore, and ACM. Table 3 compares the area of expertise of a selection of databases.

Planning Step 3 “Select digital libraries”. Description of digital libraries in computer science and software engineering.

Define inclusion and exclusion criteria

Authors should define the inclusion and exclusion criteria before conducting the review to prevent bias, although these can be adjusted later, if necessary. The selection of primary studies will depend on these criteria. Articles are included or excluded in this first selection based on abstract and primary bibliographic data. When unsure, the article is skimmed to further decide the relevance for the review. Table 4 sets out some criteria types with descriptions and examples.

Planning Step 4 “Define inclusion and exclusion criteria”. Examples of criteria type.

Define the Quality Assessment (QA) checklist

Assessing the quality of an article requires an artifact which describes how to perform a detailed assessment. A typical quality assessment is a checklist that contains multiple factors to evaluate. A numerical scale is used to assess the criteria and quantify the QA [22] . Zhou et al. [25] presented a detailed description of assessment criteria in software engineering, classified into four main aspects of study quality: Reporting, Rigor, Credibility, and Relevance. Each of these criteria can be evaluated using, for instance, a Likert-type scale [17] , as shown in Table 5 . It is essential to select the same scale for all criteria established on the quality assessment.

Planning Step 5 “Define QA assessment checklist”. Examples of QA scales and questions.

Define the “Data Extraction” form

The data extraction form represents the information necessary to answer the research questions established for the review. Synthesizing the articles is a crucial step when conducting research. Ramesh et al. [15] presented a classification scheme for computer science research, based on topics, research methods, and levels of analysis that can be used to categorize the articles selected. Classification methods and fields to consider when conducting a review are presented in Table 6 .

Planning Step 6 “Define data extraction form”. Examples of fields.

The data extraction must be relevant to the research questions, and the relationship to each of the questions should be included in the form. Kitchenham & Charters [6] presented more pertinent data that can be captured, such as conclusions, recommendations, strengths, and weaknesses. Although the data extraction form can be updated if more information is needed, this should be treated with caution since it can be time-consuming. It can therefore be helpful to first have a general background in the research topic to determine better data extraction criteria.

After defining the protocol, conducting the review requires following each of the steps previously described. Using tools can help simplify the performance of this task. Standard tools such as Excel or Google sheets allow multiple researchers to work collaboratively. Another online tool specifically designed for performing SLRs is Parsif.al 1 . This tool allows researchers, especially in the context of software engineering, to define goals and objectives, import articles using BibTeX files, eliminate duplicates, define selection criteria, and generate reports.

Build digital library search strings

Search strings are built considering the PICOC elements and synonyms to execute the search in each database library. A search string should separate the synonyms with the boolean operator OR. In comparison, the PICOC elements are separated with parentheses and the boolean operator AND. An example is presented next:

(“Smart Manufacturing” OR “Digital Manufacturing” OR “Smart Factory”) AND (“Business Process Management” OR “BPEL” OR “BPM” OR “BPMN”) AND (“Semantic Web” OR “Ontology” OR “Semantic” OR “Semantic Web Service”) AND (“Framework” OR “Extension” OR “Plugin” OR “Tool”

Gather studies

Databases that feature advanced searches enable researchers to perform search queries based on titles, abstracts, and keywords, as well as for years or areas of research. Fig. 1 presents the example of an advanced search in Scopus, using titles, abstracts, and keywords (TITLE-ABS-KEY). Most of the databases allow the use of logical operators (i.e., AND, OR). In the example, the search is for “BIG DATA” and “USER EXPERIENCE” or “UX” as a synonym.

Example of Advanced search on Scopus.

In general, bibliometric data of articles can be exported from the databases as a comma-separated-value file (CSV) or BibTeX file, which is helpful for data extraction and quantitative and qualitative analysis. In addition, researchers should take advantage of reference-management software such as Zotero, Mendeley, Endnote, or Jabref, which import bibliographic information onto the software easily.

Study Selection and Refinement

The first step in this stage is to identify any duplicates that appear in the different searches in the selected databases. Some automatic procedures, tools like Excel formulas, or programming languages (i.e., Python) can be convenient here.

In the second step, articles are included or excluded according to the selection criteria, mainly by reading titles and abstracts. Finally, the quality is assessed using the predefined scale. Fig. 2 shows an example of an article QA evaluation in Parsif.al, using a simple scale. In this scenario, the scoring procedure is the following YES= 1, PARTIALLY= 0.5, and NO or UNKNOWN = 0 . A cut-off score should be defined to filter those articles that do not pass the QA. The QA will require a light review of the full text of the article.

Performing quality assessment (QA) in Parsif.al.

Data extraction

Those articles that pass the study selection are then thoroughly and critically read. Next, the researcher completes the information required using the “data extraction” form, as illustrated in Fig. 3 , in this scenario using Parsif.al tool.

Example of data extraction form using Parsif.al.

The information required (study characteristics and findings) from each included study must be acquired and documented through careful reading. Data extraction is valuable, especially if the data requires manipulation or assumptions and inferences. Thus, information can be synthesized from the extracted data for qualitative or quantitative analysis [16] . This documentation supports clarity, precise reporting, and the ability to scrutinize and replicate the examination.

Analysis and Report

The analysis phase examines the synthesized data and extracts meaningful information from the selected articles [10] . There are two main goals in this phase.

The first goal is to analyze the literature in terms of leading authors, journals, countries, and organizations. Furthermore, it helps identify correlations among topic s . Even when not mandatory, this activity can be constructive for researchers to position their work, find trends, and find collaboration opportunities. Next, data from the selected articles can be analyzed using bibliometric analysis (BA). BA summarizes large amounts of bibliometric data to present the state of intellectual structure and emerging trends in a topic or field of research [4] . Table 7 sets out some of the most common bibliometric analysis representations.

Techniques for bibliometric analysis and examples.

Several tools can perform this type of analysis, such as Excel and Google Sheets for statistical graphs or using programming languages such as Python that has available multiple  data visualization libraries (i.e. Matplotlib, Seaborn). Cluster maps based on bibliographic data(i.e keywords, authors) can be developed in VosViewer which makes it easy to identify clusters of related items [18] . In Fig. 4 , node size is representative of the number of papers related to the keyword, and lines represent the links among keyword terms.

[1] Keyword co-relationship analysis using clusterization in vos viewer.

This second and most important goal is to answer the formulated research questions, which should include a quantitative and qualitative analysis. The quantitative analysis can make use of data categorized, labelled, or coded in the extraction form (see Section 1.6). This data can be transformed into numerical values to perform statistical analysis. One of the most widely employed method is frequency analysis, which shows the recurrence of an event, and can also represent the percental distribution of the population (i.e., percentage by technology type, frequency of use of different frameworks, etc.). Q ualitative analysis includes the narration of the results, the discussion indicating the way forward in future research work, and inferring a conclusion.

Finally, the literature review report should state the protocol to ensure others researchers can replicate the process and understand how the analysis was performed. In the protocol, it is essential to present the inclusion and exclusion criteria, quality assessment, and rationality beyond these aspects.

The presentation and reporting of results will depend on the structure of the review given by the researchers conducting the SLR, there is no one answer. This structure should tie the studies together into key themes, characteristics, or subgroups [ 28 ].

SLR can be an extensive and demanding task, however the results are beneficial in providing a comprehensive overview of the available evidence on a given topic. For this reason, researchers should keep in mind that the entire process of the SLR is tailored to answer the research question(s). This article has detailed a practical guide with the essential steps to conducting an SLR in the context of computer science and software engineering while citing multiple helpful examples and tools. It is envisaged that this method will assist researchers, and particularly early-stage researchers, in following an algorithmic approach to fulfill this task. Finally, a quick checklist is presented in Appendix A as a companion of this article.

CRediT author statement

Angela Carrera-Rivera: Conceptualization, Methodology, Writing-Original. William Ochoa-Agurto : Methodology, Writing-Original. Felix Larrinaga : Reviewing and Supervision Ganix Lasa: Reviewing and Supervision.

Declaration of Competing Interest

The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

Acknowledgments

Funding : This project has received funding from the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie Grant No. 814078.

Carrera-Rivera, A., Larrinaga, F., & Lasa, G. (2022). Context-awareness for the design of Smart-product service systems: Literature review. Computers in Industry, 142, 103730.

1 https://parsif.al/

Data Availability

What is a Literature Review? How to Write It (with Examples)

A literature review is a critical analysis and synthesis of existing research on a particular topic. It provides an overview of the current state of knowledge, identifies gaps, and highlights key findings in the literature. 1 The purpose of a literature review is to situate your own research within the context of existing scholarship, demonstrating your understanding of the topic and showing how your work contributes to the ongoing conversation in the field. Learning how to write a literature review is a critical tool for successful research. Your ability to summarize and synthesize prior research pertaining to a certain topic demonstrates your grasp on the topic of study, and assists in the learning process. 

Table of Contents

What is the purpose of literature review , a. habitat loss and species extinction: , b. range shifts and phenological changes: , c. ocean acidification and coral reefs: , d. adaptive strategies and conservation efforts: .

• Choose a Topic and Define the Research Question: 
• Decide on the Scope of Your Review: 
• Select Databases for Searches: 
• Conduct Searches and Keep Track: 
• Review the Literature: 
• Organize and Write Your Literature Review: 
• How to write a literature review faster with Paperpal? 

Frequently asked questions 

What is a literature review .

A well-conducted literature review demonstrates the researcher’s familiarity with the existing literature, establishes the context for their own research, and contributes to scholarly conversations on the topic. One of the purposes of a literature review is also to help researchers avoid duplicating previous work and ensure that their research is informed by and builds upon the existing body of knowledge.

A literature review serves several important purposes within academic and research contexts. Here are some key objectives and functions of a literature review: 2  

1. Contextualizing the Research Problem: The literature review provides a background and context for the research problem under investigation. It helps to situate the study within the existing body of knowledge. 

2. Identifying Gaps in Knowledge: By identifying gaps, contradictions, or areas requiring further research, the researcher can shape the research question and justify the significance of the study. This is crucial for ensuring that the new research contributes something novel to the field.

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3. Understanding Theoretical and Conceptual Frameworks: Literature reviews help researchers gain an understanding of the theoretical and conceptual frameworks used in previous studies. This aids in the development of a theoretical framework for the current research. 

4. Providing Methodological Insights: Another purpose of literature reviews is that it allows researchers to learn about the methodologies employed in previous studies. This can help in choosing appropriate research methods for the current study and avoiding pitfalls that others may have encountered. 

5. Establishing Credibility: A well-conducted literature review demonstrates the researcher’s familiarity with existing scholarship, establishing their credibility and expertise in the field. It also helps in building a solid foundation for the new research. 

6. Informing Hypotheses or Research Questions: The literature review guides the formulation of hypotheses or research questions by highlighting relevant findings and areas of uncertainty in existing literature. 

Literature review example 

Let’s delve deeper with a literature review example: Let’s say your literature review is about the impact of climate change on biodiversity. You might format your literature review into sections such as the effects of climate change on habitat loss and species extinction, phenological changes, and marine biodiversity. Each section would then summarize and analyze relevant studies in those areas, highlighting key findings and identifying gaps in the research. The review would conclude by emphasizing the need for further research on specific aspects of the relationship between climate change and biodiversity. The following literature review template provides a glimpse into the recommended literature review structure and content, demonstrating how research findings are organized around specific themes within a broader topic. 

Literature Review on Climate Change Impacts on Biodiversity:  

Climate change is a global phenomenon with far-reaching consequences, including significant impacts on biodiversity. This literature review synthesizes key findings from various studies: 

Climate change-induced alterations in temperature and precipitation patterns contribute to habitat loss, affecting numerous species (Thomas et al., 2004). The review discusses how these changes increase the risk of extinction, particularly for species with specific habitat requirements. 

Observations of range shifts and changes in the timing of biological events (phenology) are documented in response to changing climatic conditions (Parmesan & Yohe, 2003). These shifts affect ecosystems and may lead to mismatches between species and their resources. 

The review explores the impact of climate change on marine biodiversity, emphasizing ocean acidification’s threat to coral reefs (Hoegh-Guldberg et al., 2007). Changes in pH levels negatively affect coral calcification, disrupting the delicate balance of marine ecosystems. 

Recognizing the urgency of the situation, the literature review discusses various adaptive strategies adopted by species and conservation efforts aimed at mitigating the impacts of climate change on biodiversity (Hannah et al., 2007). It emphasizes the importance of interdisciplinary approaches for effective conservation planning. 

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How to write a good literature review 

Writing a literature review involves summarizing and synthesizing existing research on a particular topic. A good literature review format should include the following elements. 

Introduction: The introduction sets the stage for your literature review, providing context and introducing the main focus of your review. 

• Opening Statement: Begin with a general statement about the broader topic and its significance in the field. 
• Scope and Purpose: Clearly define the scope of your literature review. Explain the specific research question or objective you aim to address. 
• Organizational Framework: Briefly outline the structure of your literature review, indicating how you will categorize and discuss the existing research. 
• Significance of the Study: Highlight why your literature review is important and how it contributes to the understanding of the chosen topic. 
• Thesis Statement: Conclude the introduction with a concise thesis statement that outlines the main argument or perspective you will develop in the body of the literature review. 

Body: The body of the literature review is where you provide a comprehensive analysis of existing literature, grouping studies based on themes, methodologies, or other relevant criteria. 

• Organize by Theme or Concept: Group studies that share common themes, concepts, or methodologies. Discuss each theme or concept in detail, summarizing key findings and identifying gaps or areas of disagreement. 
• Critical Analysis: Evaluate the strengths and weaknesses of each study. Discuss the methodologies used, the quality of evidence, and the overall contribution of each work to the understanding of the topic. 
• Synthesis of Findings: Synthesize the information from different studies to highlight trends, patterns, or areas of consensus in the literature. 
• Identification of Gaps: Discuss any gaps or limitations in the existing research and explain how your review contributes to filling these gaps. 
• Transition between Sections: Provide smooth transitions between different themes or concepts to maintain the flow of your literature review. 

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Conclusion: The conclusion of your literature review should summarize the main findings, highlight the contributions of the review, and suggest avenues for future research. 

• Summary of Key Findings: Recap the main findings from the literature and restate how they contribute to your research question or objective. 
• Contributions to the Field: Discuss the overall contribution of your literature review to the existing knowledge in the field. 
• Implications and Applications: Explore the practical implications of the findings and suggest how they might impact future research or practice. 
• Recommendations for Future Research: Identify areas that require further investigation and propose potential directions for future research in the field. 
• Final Thoughts: Conclude with a final reflection on the importance of your literature review and its relevance to the broader academic community. 

Conducting a literature review 

Conducting a literature review is an essential step in research that involves reviewing and analyzing existing literature on a specific topic. It’s important to know how to do a literature review effectively, so here are the steps to follow: 1  

Choose a Topic and Define the Research Question:  

• Select a topic that is relevant to your field of study. 
• Clearly define your research question or objective. Determine what specific aspect of the topic do you want to explore? 

Decide on the Scope of Your Review:  

• Determine the timeframe for your literature review. Are you focusing on recent developments, or do you want a historical overview? 
• Consider the geographical scope. Is your review global, or are you focusing on a specific region? 
• Define the inclusion and exclusion criteria. What types of sources will you include? Are there specific types of studies or publications you will exclude? 

Select Databases for Searches:  

• Identify relevant databases for your field. Examples include PubMed, IEEE Xplore, Scopus, Web of Science, and Google Scholar. 
• Consider searching in library catalogs, institutional repositories, and specialized databases related to your topic. 

Conduct Searches and Keep Track:  

• Develop a systematic search strategy using keywords, Boolean operators (AND, OR, NOT), and other search techniques. 
• Record and document your search strategy for transparency and replicability. 
• Keep track of the articles, including publication details, abstracts, and links. Use citation management tools like EndNote, Zotero, or Mendeley to organize your references. 

Review the Literature:  

• Evaluate the relevance and quality of each source. Consider the methodology, sample size, and results of studies. 
• Organize the literature by themes or key concepts. Identify patterns, trends, and gaps in the existing research. 
• Summarize key findings and arguments from each source. Compare and contrast different perspectives. 
• Identify areas where there is a consensus in the literature and where there are conflicting opinions. 
• Provide critical analysis and synthesis of the literature. What are the strengths and weaknesses of existing research? 

Organize and Write Your Literature Review:  

• Literature review outline should be based on themes, chronological order, or methodological approaches. 
• Write a clear and coherent narrative that synthesizes the information gathered. 
• Use proper citations for each source and ensure consistency in your citation style (APA, MLA, Chicago, etc.). 
• Conclude your literature review by summarizing key findings, identifying gaps, and suggesting areas for future research. 

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A literature review is a critical and comprehensive analysis of existing literature (published and unpublished works) on a specific topic or research question and provides a synthesis of the current state of knowledge in a particular field. A well-conducted literature review is crucial for researchers to build upon existing knowledge, avoid duplication of efforts, and contribute to the advancement of their field. It also helps researchers situate their work within a broader context and facilitates the development of a sound theoretical and conceptual framework for their studies.

Literature review is a crucial component of research writing, providing a solid background for a research paper’s investigation. The aim is to keep professionals up to date by providing an understanding of ongoing developments within a specific field, including research methods, and experimental techniques used in that field, and present that knowledge in the form of a written report. Also, the depth and breadth of the literature review emphasizes the credibility of the scholar in his or her field.  

Before writing a literature review, it’s essential to undertake several preparatory steps to ensure that your review is well-researched, organized, and focused. This includes choosing a topic of general interest to you and doing exploratory research on that topic, writing an annotated bibliography, and noting major points, especially those that relate to the position you have taken on the topic. 

Literature reviews and academic research papers are essential components of scholarly work but serve different purposes within the academic realm. 3 A literature review aims to provide a foundation for understanding the current state of research on a particular topic, identify gaps or controversies, and lay the groundwork for future research. Therefore, it draws heavily from existing academic sources, including books, journal articles, and other scholarly publications. In contrast, an academic research paper aims to present new knowledge, contribute to the academic discourse, and advance the understanding of a specific research question. Therefore, it involves a mix of existing literature (in the introduction and literature review sections) and original data or findings obtained through research methods. 

Literature reviews are essential components of academic and research papers, and various strategies can be employed to conduct them effectively. If you want to know how to write a literature review for a research paper, here are four common approaches that are often used by researchers.  Chronological Review: This strategy involves organizing the literature based on the chronological order of publication. It helps to trace the development of a topic over time, showing how ideas, theories, and research have evolved.  Thematic Review: Thematic reviews focus on identifying and analyzing themes or topics that cut across different studies. Instead of organizing the literature chronologically, it is grouped by key themes or concepts, allowing for a comprehensive exploration of various aspects of the topic.  Methodological Review: This strategy involves organizing the literature based on the research methods employed in different studies. It helps to highlight the strengths and weaknesses of various methodologies and allows the reader to evaluate the reliability and validity of the research findings.  Theoretical Review: A theoretical review examines the literature based on the theoretical frameworks used in different studies. This approach helps to identify the key theories that have been applied to the topic and assess their contributions to the understanding of the subject.  It’s important to note that these strategies are not mutually exclusive, and a literature review may combine elements of more than one approach. The choice of strategy depends on the research question, the nature of the literature available, and the goals of the review. Additionally, other strategies, such as integrative reviews or systematic reviews, may be employed depending on the specific requirements of the research.

The literature review format can vary depending on the specific publication guidelines. However, there are some common elements and structures that are often followed. Here is a general guideline for the format of a literature review:  Introduction:   Provide an overview of the topic.  Define the scope and purpose of the literature review.  State the research question or objective.  Body:   Organize the literature by themes, concepts, or chronology.  Critically analyze and evaluate each source.  Discuss the strengths and weaknesses of the studies.  Highlight any methodological limitations or biases.  Identify patterns, connections, or contradictions in the existing research.  Conclusion:   Summarize the key points discussed in the literature review.  Highlight the research gap.  Address the research question or objective stated in the introduction.  Highlight the contributions of the review and suggest directions for future research.

Both annotated bibliographies and literature reviews involve the examination of scholarly sources. While annotated bibliographies focus on individual sources with brief annotations, literature reviews provide a more in-depth, integrated, and comprehensive analysis of existing literature on a specific topic. The key differences are as follows: 

References 

• Denney, A. S., & Tewksbury, R. (2013). How to write a literature review.  Journal of criminal justice education ,  24 (2), 218-234. 
• Pan, M. L. (2016).  Preparing literature reviews: Qualitative and quantitative approaches . Taylor & Francis. 
• Cantero, C. (2019). How to write a literature review.  San José State University Writing Center . 

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A literature review surveys prior research published in books, scholarly articles, and any other sources relevant to a particular issue, area of research, or theory, and by so doing, provides a description, summary, and critical evaluation of these works in relation to the research problem being investigated. Literature reviews are designed to provide an overview of sources you have used in researching a particular topic and to demonstrate to your readers how your research fits within existing scholarship about the topic.

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . Fourth edition. Thousand Oaks, CA: SAGE, 2014.

Importance of a Good Literature Review

A literature review may consist of simply a summary of key sources, but in the social sciences, a literature review usually has an organizational pattern and combines both summary and synthesis, often within specific conceptual categories . A summary is a recap of the important information of the source, but a synthesis is a re-organization, or a reshuffling, of that information in a way that informs how you are planning to investigate a research problem. The analytical features of a literature review might:

• Give a new interpretation of old material or combine new with old interpretations,
• Trace the intellectual progression of the field, including major debates,
• Depending on the situation, evaluate the sources and advise the reader on the most pertinent or relevant research, or
• Usually in the conclusion of a literature review, identify where gaps exist in how a problem has been researched to date.

Given this, the purpose of a literature review is to:

• Place each work in the context of its contribution to understanding the research problem being studied.
• Describe the relationship of each work to the others under consideration.
• Identify new ways to interpret prior research.
• Reveal any gaps that exist in the literature.
• Resolve conflicts amongst seemingly contradictory previous studies.
• Identify areas of prior scholarship to prevent duplication of effort.
• Point the way in fulfilling a need for additional research.
• Locate your own research within the context of existing literature [very important].

Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper. 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . Los Angeles, CA: SAGE, 2011; Knopf, Jeffrey W. "Doing a Literature Review." PS: Political Science and Politics 39 (January 2006): 127-132; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012.

Types of Literature Reviews

It is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the primary studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally among scholars that become part of the body of epistemological traditions within the field.

In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews. Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are a number of approaches you could adopt depending upon the type of analysis underpinning your study.

Argumentative Review This form examines literature selectively in order to support or refute an argument, deeply embedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to make summary claims of the sort found in systematic reviews [see below].

Integrative Review Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses or research problems. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication. This is the most common form of review in the social sciences.

Historical Review Few things rest in isolation from historical precedent. Historical literature reviews focus on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review A review does not always focus on what someone said [findings], but how they came about saying what they say [method of analysis]. Reviewing methods of analysis provides a framework of understanding at different levels [i.e. those of theory, substantive fields, research approaches, and data collection and analysis techniques], how researchers draw upon a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection, and data analysis. This approach helps highlight ethical issues which you should be aware of and consider as you go through your own study.

Systematic Review This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyze data from the studies that are included in the review. The goal is to deliberately document, critically evaluate, and summarize scientifically all of the research about a clearly defined research problem . Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?" This type of literature review is primarily applied to examining prior research studies in clinical medicine and allied health fields, but it is increasingly being used in the social sciences.

Theoretical Review The purpose of this form is to examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review helps to establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

NOTE: Most often the literature review will incorporate some combination of types. For example, a review that examines literature supporting or refuting an argument, assumption, or philosophical problem related to the research problem will also need to include writing supported by sources that establish the history of these arguments in the literature.

Baumeister, Roy F. and Mark R. Leary. "Writing Narrative Literature Reviews."  Review of General Psychology 1 (September 1997): 311-320; Mark R. Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Kennedy, Mary M. "Defining a Literature." Educational Researcher 36 (April 2007): 139-147; Petticrew, Mark and Helen Roberts. Systematic Reviews in the Social Sciences: A Practical Guide . Malden, MA: Blackwell Publishers, 2006; Torracro, Richard. "Writing Integrative Literature Reviews: Guidelines and Examples." Human Resource Development Review 4 (September 2005): 356-367; Rocco, Tonette S. and Maria S. Plakhotnik. "Literature Reviews, Conceptual Frameworks, and Theoretical Frameworks: Terms, Functions, and Distinctions." Human Ressource Development Review 8 (March 2008): 120-130; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

Structure and Writing Style

I.  Thinking About Your Literature Review

The structure of a literature review should include the following in support of understanding the research problem :

• An overview of the subject, issue, or theory under consideration, along with the objectives of the literature review,
• Division of works under review into themes or categories [e.g. works that support a particular position, those against, and those offering alternative approaches entirely],
• An explanation of how each work is similar to and how it varies from the others,
• Conclusions as to which pieces are best considered in their argument, are most convincing of their opinions, and make the greatest contribution to the understanding and development of their area of research.

The critical evaluation of each work should consider :

• Provenance -- what are the author's credentials? Are the author's arguments supported by evidence [e.g. primary historical material, case studies, narratives, statistics, recent scientific findings]?
• Methodology -- were the techniques used to identify, gather, and analyze the data appropriate to addressing the research problem? Was the sample size appropriate? Were the results effectively interpreted and reported?
• Objectivity -- is the author's perspective even-handed or prejudicial? Is contrary data considered or is certain pertinent information ignored to prove the author's point?
• Persuasiveness -- which of the author's theses are most convincing or least convincing?
• Validity -- are the author's arguments and conclusions convincing? Does the work ultimately contribute in any significant way to an understanding of the subject?

II.  Development of the Literature Review

Four Basic Stages of Writing 1.  Problem formulation -- which topic or field is being examined and what are its component issues? 2.  Literature search -- finding materials relevant to the subject being explored. 3.  Data evaluation -- determining which literature makes a significant contribution to the understanding of the topic. 4.  Analysis and interpretation -- discussing the findings and conclusions of pertinent literature.

Consider the following issues before writing the literature review: Clarify If your assignment is not specific about what form your literature review should take, seek clarification from your professor by asking these questions: 1.  Roughly how many sources would be appropriate to include? 2.  What types of sources should I review (books, journal articles, websites; scholarly versus popular sources)? 3.  Should I summarize, synthesize, or critique sources by discussing a common theme or issue? 4.  Should I evaluate the sources in any way beyond evaluating how they relate to understanding the research problem? 5.  Should I provide subheadings and other background information, such as definitions and/or a history? Find Models Use the exercise of reviewing the literature to examine how authors in your discipline or area of interest have composed their literature review sections. Read them to get a sense of the types of themes you might want to look for in your own research or to identify ways to organize your final review. The bibliography or reference section of sources you've already read, such as required readings in the course syllabus, are also excellent entry points into your own research. Narrow the Topic The narrower your topic, the easier it will be to limit the number of sources you need to read in order to obtain a good survey of relevant resources. Your professor will probably not expect you to read everything that's available about the topic, but you'll make the act of reviewing easier if you first limit scope of the research problem. A good strategy is to begin by searching the USC Libraries Catalog for recent books about the topic and review the table of contents for chapters that focuses on specific issues. You can also review the indexes of books to find references to specific issues that can serve as the focus of your research. For example, a book surveying the history of the Israeli-Palestinian conflict may include a chapter on the role Egypt has played in mediating the conflict, or look in the index for the pages where Egypt is mentioned in the text. Consider Whether Your Sources are Current Some disciplines require that you use information that is as current as possible. This is particularly true in disciplines in medicine and the sciences where research conducted becomes obsolete very quickly as new discoveries are made. However, when writing a review in the social sciences, a survey of the history of the literature may be required. In other words, a complete understanding the research problem requires you to deliberately examine how knowledge and perspectives have changed over time. Sort through other current bibliographies or literature reviews in the field to get a sense of what your discipline expects. You can also use this method to explore what is considered by scholars to be a "hot topic" and what is not.

III.  Ways to Organize Your Literature Review

Chronology of Events If your review follows the chronological method, you could write about the materials according to when they were published. This approach should only be followed if a clear path of research building on previous research can be identified and that these trends follow a clear chronological order of development. For example, a literature review that focuses on continuing research about the emergence of German economic power after the fall of the Soviet Union. By Publication Order your sources by publication chronology, then, only if the order demonstrates a more important trend. For instance, you could order a review of literature on environmental studies of brown fields if the progression revealed, for example, a change in the soil collection practices of the researchers who wrote and/or conducted the studies. Thematic [“conceptual categories”] A thematic literature review is the most common approach to summarizing prior research in the social and behavioral sciences. Thematic reviews are organized around a topic or issue, rather than the progression of time, although the progression of time may still be incorporated into a thematic review. For example, a review of the Internet’s impact on American presidential politics could focus on the development of online political satire. While the study focuses on one topic, the Internet’s impact on American presidential politics, it would still be organized chronologically reflecting technological developments in media. The difference in this example between a "chronological" and a "thematic" approach is what is emphasized the most: themes related to the role of the Internet in presidential politics. Note that more authentic thematic reviews tend to break away from chronological order. A review organized in this manner would shift between time periods within each section according to the point being made. Methodological A methodological approach focuses on the methods utilized by the researcher. For the Internet in American presidential politics project, one methodological approach would be to look at cultural differences between the portrayal of American presidents on American, British, and French websites. Or the review might focus on the fundraising impact of the Internet on a particular political party. A methodological scope will influence either the types of documents in the review or the way in which these documents are discussed.

Other Sections of Your Literature Review Once you've decided on the organizational method for your literature review, the sections you need to include in the paper should be easy to figure out because they arise from your organizational strategy. In other words, a chronological review would have subsections for each vital time period; a thematic review would have subtopics based upon factors that relate to the theme or issue. However, sometimes you may need to add additional sections that are necessary for your study, but do not fit in the organizational strategy of the body. What other sections you include in the body is up to you. However, only include what is necessary for the reader to locate your study within the larger scholarship about the research problem.

Here are examples of other sections, usually in the form of a single paragraph, you may need to include depending on the type of review you write:

• Current Situation : Information necessary to understand the current topic or focus of the literature review.
• Sources Used : Describes the methods and resources [e.g., databases] you used to identify the literature you reviewed.
• History : The chronological progression of the field, the research literature, or an idea that is necessary to understand the literature review, if the body of the literature review is not already a chronology.
• Selection Methods : Criteria you used to select (and perhaps exclude) sources in your literature review. For instance, you might explain that your review includes only peer-reviewed [i.e., scholarly] sources.
• Standards : Description of the way in which you present your information.
• Questions for Further Research : What questions about the field has the review sparked? How will you further your research as a result of the review?

IV.  Writing Your Literature Review

Once you've settled on how to organize your literature review, you're ready to write each section. When writing your review, keep in mind these issues.

Use Evidence A literature review section is, in this sense, just like any other academic research paper. Your interpretation of the available sources must be backed up with evidence [citations] that demonstrates that what you are saying is valid. Be Selective Select only the most important points in each source to highlight in the review. The type of information you choose to mention should relate directly to the research problem, whether it is thematic, methodological, or chronological. Related items that provide additional information, but that are not key to understanding the research problem, can be included in a list of further readings . Use Quotes Sparingly Some short quotes are appropriate if you want to emphasize a point, or if what an author stated cannot be easily paraphrased. Sometimes you may need to quote certain terminology that was coined by the author, is not common knowledge, or taken directly from the study. Do not use extensive quotes as a substitute for using your own words in reviewing the literature. Summarize and Synthesize Remember to summarize and synthesize your sources within each thematic paragraph as well as throughout the review. Recapitulate important features of a research study, but then synthesize it by rephrasing the study's significance and relating it to your own work and the work of others. Keep Your Own Voice While the literature review presents others' ideas, your voice [the writer's] should remain front and center. For example, weave references to other sources into what you are writing but maintain your own voice by starting and ending the paragraph with your own ideas and wording. Use Caution When Paraphrasing When paraphrasing a source that is not your own, be sure to represent the author's information or opinions accurately and in your own words. Even when paraphrasing an author’s work, you still must provide a citation to that work.

V.  Common Mistakes to Avoid

These are the most common mistakes made in reviewing social science research literature.

• Sources in your literature review do not clearly relate to the research problem;
• You do not take sufficient time to define and identify the most relevant sources to use in the literature review related to the research problem;
• Relies exclusively on secondary analytical sources rather than including relevant primary research studies or data;
• Uncritically accepts another researcher's findings and interpretations as valid, rather than examining critically all aspects of the research design and analysis;
• Does not describe the search procedures that were used in identifying the literature to review;
• Reports isolated statistical results rather than synthesizing them in chi-squared or meta-analytic methods; and,
• Only includes research that validates assumptions and does not consider contrary findings and alternative interpretations found in the literature.

Cook, Kathleen E. and Elise Murowchick. “Do Literature Review Skills Transfer from One Course to Another?” Psychology Learning and Teaching 13 (March 2014): 3-11; Fink, Arlene. Conducting Research Literature Reviews: From the Internet to Paper . 2nd ed. Thousand Oaks, CA: Sage, 2005; Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1998; Jesson, Jill. Doing Your Literature Review: Traditional and Systematic Techniques . London: SAGE, 2011; Literature Review Handout. Online Writing Center. Liberty University; Literature Reviews. The Writing Center. University of North Carolina; Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: SAGE, 2016; Ridley, Diana. The Literature Review: A Step-by-Step Guide for Students . 2nd ed. Los Angeles, CA: SAGE, 2012; Randolph, Justus J. “A Guide to Writing the Dissertation Literature Review." Practical Assessment, Research, and Evaluation. vol. 14, June 2009; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016; Taylor, Dena. The Literature Review: A Few Tips On Conducting It. University College Writing Centre. University of Toronto; Writing a Literature Review. Academic Skills Centre. University of Canberra.

Writing Tip

Break Out of Your Disciplinary Box!

Thinking interdisciplinarily about a research problem can be a rewarding exercise in applying new ideas, theories, or concepts to an old problem. For example, what might cultural anthropologists say about the continuing conflict in the Middle East? In what ways might geographers view the need for better distribution of social service agencies in large cities than how social workers might study the issue? You don’t want to substitute a thorough review of core research literature in your discipline for studies conducted in other fields of study. However, particularly in the social sciences, thinking about research problems from multiple vectors is a key strategy for finding new solutions to a problem or gaining a new perspective. Consult with a librarian about identifying research databases in other disciplines; almost every field of study has at least one comprehensive database devoted to indexing its research literature.

Frodeman, Robert. The Oxford Handbook of Interdisciplinarity . New York: Oxford University Press, 2010.

Another Writing Tip

Don't Just Review for Content!

While conducting a review of the literature, maximize the time you devote to writing this part of your paper by thinking broadly about what you should be looking for and evaluating. Review not just what scholars are saying, but how are they saying it. Some questions to ask:

• How are they organizing their ideas?
• What methods have they used to study the problem?
• What theories have been used to explain, predict, or understand their research problem?
• What sources have they cited to support their conclusions?
• How have they used non-textual elements [e.g., charts, graphs, figures, etc.] to illustrate key points?

When you begin to write your literature review section, you'll be glad you dug deeper into how the research was designed and constructed because it establishes a means for developing more substantial analysis and interpretation of the research problem.

Hart, Chris. Doing a Literature Review: Releasing the Social Science Research Imagination . Thousand Oaks, CA: Sage Publications, 1 998.

Yet Another Writing Tip

When Do I Know I Can Stop Looking and Move On?

Here are several strategies you can utilize to assess whether you've thoroughly reviewed the literature:

• Look for repeating patterns in the research findings . If the same thing is being said, just by different people, then this likely demonstrates that the research problem has hit a conceptual dead end. At this point consider: Does your study extend current research?  Does it forge a new path? Or, does is merely add more of the same thing being said?
• Look at sources the authors cite to in their work . If you begin to see the same researchers cited again and again, then this is often an indication that no new ideas have been generated to address the research problem.
• Search Google Scholar to identify who has subsequently cited leading scholars already identified in your literature review [see next sub-tab]. This is called citation tracking and there are a number of sources that can help you identify who has cited whom, particularly scholars from outside of your discipline. Here again, if the same authors are being cited again and again, this may indicate no new literature has been written on the topic.

Onwuegbuzie, Anthony J. and Rebecca Frels. Seven Steps to a Comprehensive Literature Review: A Multimodal and Cultural Approach . Los Angeles, CA: Sage, 2016; Sutton, Anthea. Systematic Approaches to a Successful Literature Review . Los Angeles, CA: Sage Publications, 2016.

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Research Methods

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• Literature Review Research
• Research Design
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Literature Review

• What is a Literature Review?
• What is NOT a Literature Review?
• Purposes of a Literature Review
• Types of Literature Reviews
• Literature Reviews vs. Systematic Reviews
• Systematic vs. Meta-Analysis

Literature Review  is a comprehensive survey of the works published in a particular field of study or line of research, usually over a specific period of time, in the form of an in-depth, critical bibliographic essay or annotated list in which attention is drawn to the most significant works.

Also, we can define a literature review as the collected body of scholarly works related to a topic:

• Summarizes and analyzes previous research relevant to a topic
• Includes scholarly books and articles published in academic journals
• Can be an specific scholarly paper or a section in a research paper

The objective of a Literature Review is to find previous published scholarly works relevant to an specific topic

• Help gather ideas or information
• Keep up to date in current trends and findings
• Help develop new questions

A literature review is important because it:

• Explains the background of research on a topic.
• Demonstrates why a topic is significant to a subject area.
• Helps focus your own research questions or problems
• Discovers relationships between research studies/ideas.
• Suggests unexplored ideas or populations
• Identifies major themes, concepts, and researchers on a topic.
• Tests assumptions; may help counter preconceived ideas and remove unconscious bias.
• Identifies critical gaps, points of disagreement, or potentially flawed methodology or theoretical approaches.
• Indicates potential directions for future research.

All content in this section is from Literature Review Research from Old Dominion University 

Keep in mind the following, a literature review is NOT:

Not an essay 

Not an annotated bibliography  in which you summarize each article that you have reviewed.  A literature review goes beyond basic summarizing to focus on the critical analysis of the reviewed works and their relationship to your research question.

Not a research paper   where you select resources to support one side of an issue versus another.  A lit review should explain and consider all sides of an argument in order to avoid bias, and areas of agreement and disagreement should be highlighted.

A literature review serves several purposes. For example, it

• provides thorough knowledge of previous studies; introduces seminal works.
• helps focus one’s own research topic.
• identifies a conceptual framework for one’s own research questions or problems; indicates potential directions for future research.
• suggests previously unused or underused methodologies, designs, quantitative and qualitative strategies.
• identifies gaps in previous studies; identifies flawed methodologies and/or theoretical approaches; avoids replication of mistakes.
• helps the researcher avoid repetition of earlier research.
• suggests unexplored populations.
• determines whether past studies agree or disagree; identifies controversy in the literature.
• tests assumptions; may help counter preconceived ideas and remove unconscious bias.

As Kennedy (2007) notes*, it is important to think of knowledge in a given field as consisting of three layers. First, there are the primary studies that researchers conduct and publish. Second are the reviews of those studies that summarize and offer new interpretations built from and often extending beyond the original studies. Third, there are the perceptions, conclusions, opinion, and interpretations that are shared informally that become part of the lore of field. In composing a literature review, it is important to note that it is often this third layer of knowledge that is cited as "true" even though it often has only a loose relationship to the primary studies and secondary literature reviews.

Given this, while literature reviews are designed to provide an overview and synthesis of pertinent sources you have explored, there are several approaches to how they can be done, depending upon the type of analysis underpinning your study. Listed below are definitions of types of literature reviews:

Argumentative Review      This form examines literature selectively in order to support or refute an argument, deeply imbedded assumption, or philosophical problem already established in the literature. The purpose is to develop a body of literature that establishes a contrarian viewpoint. Given the value-laden nature of some social science research [e.g., educational reform; immigration control], argumentative approaches to analyzing the literature can be a legitimate and important form of discourse. However, note that they can also introduce problems of bias when they are used to to make summary claims of the sort found in systematic reviews.

Integrative Review      Considered a form of research that reviews, critiques, and synthesizes representative literature on a topic in an integrated way such that new frameworks and perspectives on the topic are generated. The body of literature includes all studies that address related or identical hypotheses. A well-done integrative review meets the same standards as primary research in regard to clarity, rigor, and replication.

Historical Review      Few things rest in isolation from historical precedent. Historical reviews are focused on examining research throughout a period of time, often starting with the first time an issue, concept, theory, phenomena emerged in the literature, then tracing its evolution within the scholarship of a discipline. The purpose is to place research in a historical context to show familiarity with state-of-the-art developments and to identify the likely directions for future research.

Methodological Review      A review does not always focus on what someone said [content], but how they said it [method of analysis]. This approach provides a framework of understanding at different levels (i.e. those of theory, substantive fields, research approaches and data collection and analysis techniques), enables researchers to draw on a wide variety of knowledge ranging from the conceptual level to practical documents for use in fieldwork in the areas of ontological and epistemological consideration, quantitative and qualitative integration, sampling, interviewing, data collection and data analysis, and helps highlight many ethical issues which we should be aware of and consider as we go through our study.

Systematic Review      This form consists of an overview of existing evidence pertinent to a clearly formulated research question, which uses pre-specified and standardized methods to identify and critically appraise relevant research, and to collect, report, and analyse data from the studies that are included in the review. Typically it focuses on a very specific empirical question, often posed in a cause-and-effect form, such as "To what extent does A contribute to B?"

Theoretical Review      The purpose of this form is to concretely examine the corpus of theory that has accumulated in regard to an issue, concept, theory, phenomena. The theoretical literature review help establish what theories already exist, the relationships between them, to what degree the existing theories have been investigated, and to develop new hypotheses to be tested. Often this form is used to help establish a lack of appropriate theories or reveal that current theories are inadequate for explaining new or emerging research problems. The unit of analysis can focus on a theoretical concept or a whole theory or framework.

* Kennedy, Mary M. "Defining a Literature."  Educational Researcher  36 (April 2007): 139-147.

All content in this section is from The Literature Review created by Dr. Robert Larabee USC

Robinson, P. and Lowe, J. (2015),  Literature reviews vs systematic reviews.  Australian and New Zealand Journal of Public Health, 39: 103-103. doi: 10.1111/1753-6405.12393

What's in the name? The difference between a Systematic Review and a Literature Review, and why it matters . By Lynn Kysh from University of Southern California

Systematic review or meta-analysis?

A  systematic review  answers a defined research question by collecting and summarizing all empirical evidence that fits pre-specified eligibility criteria.

A  meta-analysis  is the use of statistical methods to summarize the results of these studies.

Systematic reviews, just like other research articles, can be of varying quality. They are a significant piece of work (the Centre for Reviews and Dissemination at York estimates that a team will take 9-24 months), and to be useful to other researchers and practitioners they should have:

• clearly stated objectives with pre-defined eligibility criteria for studies
• explicit, reproducible methodology
• a systematic search that attempts to identify all studies
• assessment of the validity of the findings of the included studies (e.g. risk of bias)
• systematic presentation, and synthesis, of the characteristics and findings of the included studies

Not all systematic reviews contain meta-analysis. 

Meta-analysis is the use of statistical methods to summarize the results of independent studies. By combining information from all relevant studies, meta-analysis can provide more precise estimates of the effects of health care than those derived from the individual studies included within a review.  More information on meta-analyses can be found in  Cochrane Handbook, Chapter 9 .

A meta-analysis goes beyond critique and integration and conducts secondary statistical analysis on the outcomes of similar studies.  It is a systematic review that uses quantitative methods to synthesize and summarize the results.

An advantage of a meta-analysis is the ability to be completely objective in evaluating research findings.  Not all topics, however, have sufficient research evidence to allow a meta-analysis to be conducted.  In that case, an integrative review is an appropriate strategy. 

Some of the content in this section is from Systematic reviews and meta-analyses: step by step guide created by Kate McAllister.

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What is a literature review?

A literature review is an integrated analysis -- not just a summary-- of scholarly writings and other relevant evidence related directly to your research question.  That is, it represents a synthesis of the evidence that provides background information on your topic and shows a association between the evidence and your research question.

A literature review may be a stand alone work or the introduction to a larger research paper, depending on the assignment.  Rely heavily on the guidelines your instructor has given you.

Why is it important?

A literature review is important because it:

• Explains the background of research on a topic.
• Demonstrates why a topic is significant to a subject area.
• Discovers relationships between research studies/ideas.
• Identifies major themes, concepts, and researchers on a topic.
• Identifies critical gaps and points of disagreement.
• Discusses further research questions that logically come out of the previous studies.

APA7 Style resources

APA Style Blog - for those harder to find answers

1. Choose a topic. Define your research question.

Your literature review should be guided by your central research question.  The literature represents background and research developments related to a specific research question, interpreted and analyzed by you in a synthesized way.

• Make sure your research question is not too broad or too narrow.  Is it manageable?
• Begin writing down terms that are related to your question. These will be useful for searches later.
• If you have the opportunity, discuss your topic with your professor and your class mates.

2. Decide on the scope of your review

How many studies do you need to look at? How comprehensive should it be? How many years should it cover? 

• This may depend on your assignment.  How many sources does the assignment require?

3. Select the databases you will use to conduct your searches.

Make a list of the databases you will search. 

Where to find databases:

• use the tabs on this guide
• Find other databases in the Nursing Information Resources web page
• More on the Medical Library web page
• ... and more on the Yale University Library web page

4. Conduct your searches to find the evidence. Keep track of your searches.

• Use the key words in your question, as well as synonyms for those words, as terms in your search. Use the database tutorials for help.
• Save the searches in the databases. This saves time when you want to redo, or modify, the searches. It is also helpful to use as a guide is the searches are not finding any useful results.
• Review the abstracts of research studies carefully. This will save you time.
• Use the bibliographies and references of research studies you find to locate others.
• Check with your professor, or a subject expert in the field, if you are missing any key works in the field.
• Ask your librarian for help at any time.
• Use a citation manager, such as EndNote as the repository for your citations. See the EndNote tutorials for help.

Review the literature

Some questions to help you analyze the research:

• What was the research question of the study you are reviewing? What were the authors trying to discover?
• Was the research funded by a source that could influence the findings?
• What were the research methodologies? Analyze its literature review, the samples and variables used, the results, and the conclusions.
• Does the research seem to be complete? Could it have been conducted more soundly? What further questions does it raise?
• If there are conflicting studies, why do you think that is?
• How are the authors viewed in the field? Has this study been cited? If so, how has it been analyzed?

Tips: 

• Review the abstracts carefully.  
• Keep careful notes so that you may track your thought processes during the research process.
• Create a matrix of the studies for easy analysis, and synthesis, across all of the studies.
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Conducting a literature review: why do a literature review, why do a literature review.

• How To Find "The Literature"
• Found it -- Now What?

Besides the obvious reason for students -- because it is assigned! -- a literature review helps you explore the research that has come before you, to see how your research question has (or has not) already been addressed.

You identify:

• core research in the field
• experts in the subject area
• methodology you may want to use (or avoid)
• gaps in knowledge -- or where your research would fit in

It Also Helps You:

• Publish and share your findings
• Justify requests for grants and other funding
• Identify best practices to inform practice
• Set wider context for a program evaluation
• Compile information to support community organizing

Great brief overview, from NCSU

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Literature Review: The What, Why and How-to Guide: Literature Reviews?

• Literature Reviews?
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• Other Academic Writings

What is a Literature Review?

So, what is a literature review .

"A literature review is an account of what has been published on a topic by accredited scholars and researchers. In writing the literature review, your purpose is to convey to your reader what knowledge and ideas have been established on a topic, and what their strengths and weaknesses are. As a piece of writing, the literature review must be defined by a guiding concept (e.g., your research objective, the problem or issue you are discussing, or your argumentative thesis). It is not just a descriptive list of the material available or a set of summaries." - Quote from Taylor, D. (n.d)."The Literature Review: A Few Tips on Conducting it".

• Citation: "The Literature Review: A Few Tips on Conducting it"

What kinds of literature reviews are written?

Each field has a particular way to do reviews for academic research literature. In the social sciences and humanities the most common are:

• Narrative Reviews: The purpose of this type of review is to describe the current state of the research on a specific research topic and to offer a critical analysis of the literature reviewed. Studies are grouped by research/theoretical categories, and themes and trends, strengths and weaknesses, and gaps are identified. The review ends with a conclusion section that summarizes the findings regarding the state of the research of the specific study, the gaps identify and if applicable, explains how the author's research will address gaps identify in the review and expand the knowledge on the topic reviewed.
• Book review essays/ Historiographical review essays : A type of literature review typical in History and related fields, e.g., Latin American studies. For example, the Latin American Research Review explains that the purpose of this type of review is to “(1) to familiarize readers with the subject, approach, arguments, and conclusions found in a group of books whose common focus is a historical period; a country or region within Latin America; or a practice, development, or issue of interest to specialists and others; (2) to locate these books within current scholarship, critical methodologies, and approaches; and (3) to probe the relation of these new books to previous work on the subject, especially canonical texts. Unlike individual book reviews, the cluster reviews found in LARR seek to address the state of the field or discipline and not solely the works at issue.” - LARR

What are the Goals of Creating a Literature Review?

• To develop a theory or evaluate an existing theory
• To summarize the historical or existing state of a research topic
• Identify a problem in a field of research 
• Baumeister, R.F. & Leary, M.R. (1997). "Writing narrative literature reviews," Review of General Psychology , 1(3), 311-320.

When do you need to write a Literature Review?

• When writing a prospectus or a thesis/dissertation
• When writing a research paper
• When writing a grant proposal

In all these cases you need to dedicate a chapter in these works to showcase what has been written about your research topic and to point out how your own research will shed new light into a body of scholarship.

Where I can find examples of Literature Reviews?

Note:  In the humanities, even if they don't use the term "literature review", they may have a dedicated  chapter that reviewed the "critical bibliography" or they incorporated that review in the introduction or first chapter of the dissertation, book, or article.

• UCSB electronic theses and dissertations In partnership with the Graduate Division, the UC Santa Barbara Library is making available theses and dissertations produced by UCSB students. Currently included in ADRL are theses and dissertations that were originally filed electronically, starting in 2011. In future phases of ADRL, all theses and dissertations created by UCSB students may be digitized and made available.

Where to Find Standalone Literature Reviews

Literature reviews are also written as standalone articles as a way to survey a particular research topic in-depth. This type of literature review looks at a topic from a historical perspective to see how the understanding of the topic has changed over time. 

• Find e-Journals for Standalone Literature Reviews The best way to get familiar with and to learn how to write literature reviews is by reading them. You can use our Journal Search option to find journals that specialize in publishing literature reviews from major disciplines like anthropology, sociology, etc. Usually these titles are called, "Annual Review of [discipline name] OR [Discipline name] Review. This option works best if you know the title of the publication you are looking for. Below are some examples of these journals! more... less... Journal Search can be found by hovering over the link for Research on the library website.

Social Sciences

• Annual Review of Anthropology
• Annual Review of Political Science
• Annual Review of Sociology
• Ethnic Studies Review

Hard science and health sciences:

• Annual Review of Biomedical Data Science
• Annual Review of Materials Science
• Systematic Review From journal site: "The journal Systematic Reviews encompasses all aspects of the design, conduct, and reporting of systematic reviews" in the health sciences.
• << Previous: Overview
• Next: Strategies to Finding Sources >>
• Last Updated: Mar 5, 2024 11:44 AM
• URL: https://guides.library.ucsb.edu/litreview

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Home » Literature Review – Types Writing Guide and Examples

Literature Review – Types Writing Guide and Examples

Table of Contents

Literature Review

Definition:

A literature review is a comprehensive and critical analysis of the existing literature on a particular topic or research question. It involves identifying, evaluating, and synthesizing relevant literature, including scholarly articles, books, and other sources, to provide a summary and critical assessment of what is known about the topic.

Types of Literature Review

Types of Literature Review are as follows:

• Narrative literature review : This type of review involves a comprehensive summary and critical analysis of the available literature on a particular topic or research question. It is often used as an introductory section of a research paper.
• Systematic literature review: This is a rigorous and structured review that follows a pre-defined protocol to identify, evaluate, and synthesize all relevant studies on a specific research question. It is often used in evidence-based practice and systematic reviews.
• Meta-analysis: This is a quantitative review that uses statistical methods to combine data from multiple studies to derive a summary effect size. It provides a more precise estimate of the overall effect than any individual study.
• Scoping review: This is a preliminary review that aims to map the existing literature on a broad topic area to identify research gaps and areas for further investigation.
• Critical literature review : This type of review evaluates the strengths and weaknesses of the existing literature on a particular topic or research question. It aims to provide a critical analysis of the literature and identify areas where further research is needed.
• Conceptual literature review: This review synthesizes and integrates theories and concepts from multiple sources to provide a new perspective on a particular topic. It aims to provide a theoretical framework for understanding a particular research question.
• Rapid literature review: This is a quick review that provides a snapshot of the current state of knowledge on a specific research question or topic. It is often used when time and resources are limited.
• Thematic literature review : This review identifies and analyzes common themes and patterns across a body of literature on a particular topic. It aims to provide a comprehensive overview of the literature and identify key themes and concepts.
• Realist literature review: This review is often used in social science research and aims to identify how and why certain interventions work in certain contexts. It takes into account the context and complexities of real-world situations.
• State-of-the-art literature review : This type of review provides an overview of the current state of knowledge in a particular field, highlighting the most recent and relevant research. It is often used in fields where knowledge is rapidly evolving, such as technology or medicine.
• Integrative literature review: This type of review synthesizes and integrates findings from multiple studies on a particular topic to identify patterns, themes, and gaps in the literature. It aims to provide a comprehensive understanding of the current state of knowledge on a particular topic.
• Umbrella literature review : This review is used to provide a broad overview of a large and diverse body of literature on a particular topic. It aims to identify common themes and patterns across different areas of research.
• Historical literature review: This type of review examines the historical development of research on a particular topic or research question. It aims to provide a historical context for understanding the current state of knowledge on a particular topic.
• Problem-oriented literature review : This review focuses on a specific problem or issue and examines the literature to identify potential solutions or interventions. It aims to provide practical recommendations for addressing a particular problem or issue.
• Mixed-methods literature review : This type of review combines quantitative and qualitative methods to synthesize and analyze the available literature on a particular topic. It aims to provide a more comprehensive understanding of the research question by combining different types of evidence.

Parts of Literature Review

Parts of a literature review are as follows:

Introduction

The introduction of a literature review typically provides background information on the research topic and why it is important. It outlines the objectives of the review, the research question or hypothesis, and the scope of the review.

Literature Search

This section outlines the search strategy and databases used to identify relevant literature. The search terms used, inclusion and exclusion criteria, and any limitations of the search are described.

Literature Analysis

The literature analysis is the main body of the literature review. This section summarizes and synthesizes the literature that is relevant to the research question or hypothesis. The review should be organized thematically, chronologically, or by methodology, depending on the research objectives.

Critical Evaluation

Critical evaluation involves assessing the quality and validity of the literature. This includes evaluating the reliability and validity of the studies reviewed, the methodology used, and the strength of the evidence.

The conclusion of the literature review should summarize the main findings, identify any gaps in the literature, and suggest areas for future research. It should also reiterate the importance of the research question or hypothesis and the contribution of the literature review to the overall research project.

The references list includes all the sources cited in the literature review, and follows a specific referencing style (e.g., APA, MLA, Harvard).

How to write Literature Review

Here are some steps to follow when writing a literature review:

• Define your research question or topic : Before starting your literature review, it is essential to define your research question or topic. This will help you identify relevant literature and determine the scope of your review.
• Conduct a comprehensive search: Use databases and search engines to find relevant literature. Look for peer-reviewed articles, books, and other academic sources that are relevant to your research question or topic.
• Evaluate the sources: Once you have found potential sources, evaluate them critically to determine their relevance, credibility, and quality. Look for recent publications, reputable authors, and reliable sources of data and evidence.
• Organize your sources: Group the sources by theme, method, or research question. This will help you identify similarities and differences among the literature, and provide a structure for your literature review.
• Analyze and synthesize the literature : Analyze each source in depth, identifying the key findings, methodologies, and conclusions. Then, synthesize the information from the sources, identifying patterns and themes in the literature.
• Write the literature review : Start with an introduction that provides an overview of the topic and the purpose of the literature review. Then, organize the literature according to your chosen structure, and analyze and synthesize the sources. Finally, provide a conclusion that summarizes the key findings of the literature review, identifies gaps in knowledge, and suggests areas for future research.
• Edit and proofread: Once you have written your literature review, edit and proofread it carefully to ensure that it is well-organized, clear, and concise.

Examples of Literature Review

Here’s an example of how a literature review can be conducted for a thesis on the topic of “ The Impact of Social Media on Teenagers’ Mental Health”:

• Start by identifying the key terms related to your research topic. In this case, the key terms are “social media,” “teenagers,” and “mental health.”
• Use academic databases like Google Scholar, JSTOR, or PubMed to search for relevant articles, books, and other publications. Use these keywords in your search to narrow down your results.
• Evaluate the sources you find to determine if they are relevant to your research question. You may want to consider the publication date, author’s credentials, and the journal or book publisher.
• Begin reading and taking notes on each source, paying attention to key findings, methodologies used, and any gaps in the research.
• Organize your findings into themes or categories. For example, you might categorize your sources into those that examine the impact of social media on self-esteem, those that explore the effects of cyberbullying, and those that investigate the relationship between social media use and depression.
• Synthesize your findings by summarizing the key themes and highlighting any gaps or inconsistencies in the research. Identify areas where further research is needed.
• Use your literature review to inform your research questions and hypotheses for your thesis.

For example, after conducting a literature review on the impact of social media on teenagers’ mental health, a thesis might look like this:

“Using a mixed-methods approach, this study aims to investigate the relationship between social media use and mental health outcomes in teenagers. Specifically, the study will examine the effects of cyberbullying, social comparison, and excessive social media use on self-esteem, anxiety, and depression. Through an analysis of survey data and qualitative interviews with teenagers, the study will provide insight into the complex relationship between social media use and mental health outcomes, and identify strategies for promoting positive mental health outcomes in young people.”

Reference: Smith, J., Jones, M., & Lee, S. (2019). The effects of social media use on adolescent mental health: A systematic review. Journal of Adolescent Health, 65(2), 154-165. doi:10.1016/j.jadohealth.2019.03.024

Reference Example: Author, A. A., Author, B. B., & Author, C. C. (Year). Title of article. Title of Journal, volume number(issue number), page range. doi:0000000/000000000000 or URL

Applications of Literature Review

some applications of literature review in different fields:

• Social Sciences: In social sciences, literature reviews are used to identify gaps in existing research, to develop research questions, and to provide a theoretical framework for research. Literature reviews are commonly used in fields such as sociology, psychology, anthropology, and political science.
• Natural Sciences: In natural sciences, literature reviews are used to summarize and evaluate the current state of knowledge in a particular field or subfield. Literature reviews can help researchers identify areas where more research is needed and provide insights into the latest developments in a particular field. Fields such as biology, chemistry, and physics commonly use literature reviews.
• Health Sciences: In health sciences, literature reviews are used to evaluate the effectiveness of treatments, identify best practices, and determine areas where more research is needed. Literature reviews are commonly used in fields such as medicine, nursing, and public health.
• Humanities: In humanities, literature reviews are used to identify gaps in existing knowledge, develop new interpretations of texts or cultural artifacts, and provide a theoretical framework for research. Literature reviews are commonly used in fields such as history, literary studies, and philosophy.

Role of Literature Review in Research

Here are some applications of literature review in research:

• Identifying Research Gaps : Literature review helps researchers identify gaps in existing research and literature related to their research question. This allows them to develop new research questions and hypotheses to fill those gaps.
• Developing Theoretical Framework: Literature review helps researchers develop a theoretical framework for their research. By analyzing and synthesizing existing literature, researchers can identify the key concepts, theories, and models that are relevant to their research.
• Selecting Research Methods : Literature review helps researchers select appropriate research methods and techniques based on previous research. It also helps researchers to identify potential biases or limitations of certain methods and techniques.
• Data Collection and Analysis: Literature review helps researchers in data collection and analysis by providing a foundation for the development of data collection instruments and methods. It also helps researchers to identify relevant data sources and identify potential data analysis techniques.
• Communicating Results: Literature review helps researchers to communicate their results effectively by providing a context for their research. It also helps to justify the significance of their findings in relation to existing research and literature.

Purpose of Literature Review

Some of the specific purposes of a literature review are as follows:

• To provide context: A literature review helps to provide context for your research by situating it within the broader body of literature on the topic.
• To identify gaps and inconsistencies: A literature review helps to identify areas where further research is needed or where there are inconsistencies in the existing literature.
• To synthesize information: A literature review helps to synthesize the information from multiple sources and present a coherent and comprehensive picture of the current state of knowledge on the topic.
• To identify key concepts and theories : A literature review helps to identify key concepts and theories that are relevant to your research question and provide a theoretical framework for your study.
• To inform research design: A literature review can inform the design of your research study by identifying appropriate research methods, data sources, and research questions.

Characteristics of Literature Review

Some Characteristics of Literature Review are as follows:

• Identifying gaps in knowledge: A literature review helps to identify gaps in the existing knowledge and research on a specific topic or research question. By analyzing and synthesizing the literature, you can identify areas where further research is needed and where new insights can be gained.
• Establishing the significance of your research: A literature review helps to establish the significance of your own research by placing it in the context of existing research. By demonstrating the relevance of your research to the existing literature, you can establish its importance and value.
• Informing research design and methodology : A literature review helps to inform research design and methodology by identifying the most appropriate research methods, techniques, and instruments. By reviewing the literature, you can identify the strengths and limitations of different research methods and techniques, and select the most appropriate ones for your own research.
• Supporting arguments and claims: A literature review provides evidence to support arguments and claims made in academic writing. By citing and analyzing the literature, you can provide a solid foundation for your own arguments and claims.
• I dentifying potential collaborators and mentors: A literature review can help identify potential collaborators and mentors by identifying researchers and practitioners who are working on related topics or using similar methods. By building relationships with these individuals, you can gain valuable insights and support for your own research and practice.
• Keeping up-to-date with the latest research : A literature review helps to keep you up-to-date with the latest research on a specific topic or research question. By regularly reviewing the literature, you can stay informed about the latest findings and developments in your field.

Advantages of Literature Review

There are several advantages to conducting a literature review as part of a research project, including:

• Establishing the significance of the research : A literature review helps to establish the significance of the research by demonstrating the gap or problem in the existing literature that the study aims to address.
• Identifying key concepts and theories: A literature review can help to identify key concepts and theories that are relevant to the research question, and provide a theoretical framework for the study.
• Supporting the research methodology : A literature review can inform the research methodology by identifying appropriate research methods, data sources, and research questions.
• Providing a comprehensive overview of the literature : A literature review provides a comprehensive overview of the current state of knowledge on a topic, allowing the researcher to identify key themes, debates, and areas of agreement or disagreement.
• Identifying potential research questions: A literature review can help to identify potential research questions and areas for further investigation.
• Avoiding duplication of research: A literature review can help to avoid duplication of research by identifying what has already been done on a topic, and what remains to be done.
• Enhancing the credibility of the research : A literature review helps to enhance the credibility of the research by demonstrating the researcher’s knowledge of the existing literature and their ability to situate their research within a broader context.

Limitations of Literature Review

Limitations of Literature Review are as follows:

• Limited scope : Literature reviews can only cover the existing literature on a particular topic, which may be limited in scope or depth.
• Publication bias : Literature reviews may be influenced by publication bias, which occurs when researchers are more likely to publish positive results than negative ones. This can lead to an incomplete or biased picture of the literature.
• Quality of sources : The quality of the literature reviewed can vary widely, and not all sources may be reliable or valid.
• Time-limited: Literature reviews can become quickly outdated as new research is published, making it difficult to keep up with the latest developments in a field.
• Subjective interpretation : Literature reviews can be subjective, and the interpretation of the findings can vary depending on the researcher’s perspective or bias.
• Lack of original data : Literature reviews do not generate new data, but rather rely on the analysis of existing studies.
• Risk of plagiarism: It is important to ensure that literature reviews do not inadvertently contain plagiarism, which can occur when researchers use the work of others without proper attribution.

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Researcher, Academic Writer, Web developer

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Types of Literature Review — A Guide for Researchers

Table of Contents

Researchers often face challenges when choosing the appropriate type of literature review for their study. Regardless of the type of research design and the topic of a research problem , they encounter numerous queries, including:

What is the right type of literature review my study demands?

• How do we gather the data?
• How to conduct one?
• How reliable are the review findings?
• How do we employ them in our research? And the list goes on.

If you’re also dealing with such a hefty questionnaire, this article is of help. Read through this piece of guide to get an exhaustive understanding of the different types of literature reviews and their step-by-step methodologies along with a dash of pros and cons discussed.

Heading from scratch!

What is a Literature Review?

A literature review provides a comprehensive overview of existing knowledge on a particular topic, which is quintessential to any research project. Researchers employ various literature reviews based on their research goals and methodologies. The review process involves assembling, critically evaluating, and synthesizing existing scientific publications relevant to the research question at hand. It serves multiple purposes, including identifying gaps in existing literature, providing theoretical background, and supporting the rationale for a research study.

What is the importance of a Literature review in research?

Literature review in research serves several key purposes, including:

• Background of the study: Provides proper context for the research. It helps researchers understand the historical development, theoretical perspectives, and key debates related to their research topic.
• Identification of research gaps: By reviewing existing literature, researchers can identify gaps or inconsistencies in knowledge, paving the way for new research questions and hypotheses relevant to their study.
• Theoretical framework development: Facilitates the development of theoretical frameworks by cultivating diverse perspectives and empirical findings. It helps researchers refine their conceptualizations and theoretical models.
• Methodological guidance: Offers methodological guidance by highlighting the documented research methods and techniques used in previous studies. It assists researchers in selecting appropriate research designs, data collection methods, and analytical tools.
• Quality assurance and upholding academic integrity: Conducting a thorough literature review demonstrates the rigor and scholarly integrity of the research. It ensures that researchers are aware of relevant studies and can accurately attribute ideas and findings to their original sources.

Types of Literature Review

Literature review plays a crucial role in guiding the research process , from providing the background of the study to research dissemination and contributing to the synthesis of the latest theoretical literature review findings in academia.

However, not all types of literature reviews are the same; they vary in terms of methodology, approach, and purpose. Let's have a look at the various types of literature reviews to gain a deeper understanding of their applications.

1. Narrative Literature Review

A narrative literature review, also known as a traditional literature review, involves analyzing and summarizing existing literature without adhering to a structured methodology. It typically provides a descriptive overview of key concepts, theories, and relevant findings of the research topic.

Unlike other types of literature reviews, narrative reviews reinforce a more traditional approach, emphasizing the interpretation and discussion of the research findings rather than strict adherence to methodological review criteria. It helps researchers explore diverse perspectives and insights based on the research topic and acts as preliminary work for further investigation.

Steps to Conduct a Narrative Literature Review

Source:- https://www.researchgate.net/figure/Steps-of-writing-a-narrative-review_fig1_354466408

Define the research question or topic:

The first step in conducting a narrative literature review is to clearly define the research question or topic of interest. Defining the scope and purpose of the review includes — What specific aspect of the topic do you want to explore? What are the main objectives of the research? Refine your research question based on the specific area you want to explore.

Conduct a thorough literature search

Once the research question is defined, you can conduct a comprehensive literature search. Explore and use relevant databases and search engines like SciSpace Discover to identify credible and pertinent, scholarly articles and publications.

Select relevant studies

Before choosing the right set of studies, it’s vital to determine inclusion (studies that should possess the required factors) and exclusion criteria for the literature and then carefully select papers. For example — Which studies or sources will be included based on relevance, quality, and publication date?

*Important (applies to all the reviews): Inclusion criteria are the factors a study must include (For example: Include only peer-reviewed articles published between 2022-2023, etc.). Exclusion criteria are the factors that wouldn’t be required for your search strategy (Example: exclude irrelevant papers, preprints, written in non-English, etc.)

Critically analyze the literature

Once the relevant studies are shortlisted, evaluate the methodology, findings, and limitations of each source and jot down key themes, patterns, and contradictions. You can use efficient AI tools to conduct a thorough literature review and analyze all the required information.

Synthesize and integrate the findings

Now, you can weave together the reviewed studies, underscoring significant findings such that new frameworks, contrasting viewpoints, and identifying knowledge gaps.

Discussion and conclusion

This is an important step before crafting a narrative review — summarize the main findings of the review and discuss their implications in the relevant field. For example — What are the practical implications for practitioners? What are the directions for future research for them?

Write a cohesive narrative review

Organize the review into coherent sections and structure your review logically, guiding the reader through the research landscape and offering valuable insights. Use clear and concise language to convey key points effectively.

Structure of Narrative Literature Review

A well-structured, narrative analysis or literature review typically includes the following components:

• Introduction: Provides an overview of the topic, objectives of the study, and rationale for the review.
• Background: Highlights relevant background information and establish the context for the review.
• Main Body: Indexes the literature into thematic sections or categories, discussing key findings, methodologies, and theoretical frameworks.
• Discussion: Analyze and synthesize the findings of the reviewed studies, stressing similarities, differences, and any gaps in the literature.
• Conclusion: Summarizes the main findings of the review, identifies implications for future research, and offers concluding remarks.

Pros and Cons of Narrative Literature Review

• Flexibility in methodology and doesn’t necessarily rely on structured methodologies
• Follows traditional approach and provides valuable and contextualized insights
• Suitable for exploring complex or interdisciplinary topics. For example — Climate change and human health, Cybersecurity and privacy in the digital age, and more
• Subjectivity in data selection and interpretation
• Potential for bias in the review process
• Lack of rigor compared to systematic reviews

Example of Well-Executed Narrative Literature Reviews

Paper title:  Examining Moral Injury in Clinical Practice: A Narrative Literature Review

Source: SciSpace

You can also chat with the papers using SciSpace ChatPDF to get a thorough understanding of the research papers.

While narrative reviews offer flexibility, academic integrity remains paramount. So, ensure proper citation of all sources and maintain a transparent and factual approach throughout your critical narrative review, itself.

2. Systematic Review

A systematic literature review is one of the comprehensive types of literature review that follows a structured approach to assembling, analyzing, and synthesizing existing research relevant to a particular topic or question. It involves clearly defined criteria for exploring and choosing studies, as well as rigorous methods for evaluating the quality of relevant studies.

It plays a prominent role in evidence-based practice and decision-making across various domains, including healthcare, social sciences, education, health sciences, and more. By systematically investigating available literature, researchers can identify gaps in knowledge, evaluate the strength of evidence, and report future research directions.

Steps to Conduct Systematic Reviews

Source:- https://www.researchgate.net/figure/Steps-of-Systematic-Literature-Review_fig1_321422320

Here are the key steps involved in conducting a systematic literature review

Formulate a clear and focused research question

Clearly define the research question or objective of the review. It helps to centralize the literature search strategy and determine inclusion criteria for relevant studies.

Develop a thorough literature search strategy

Design a comprehensive search strategy to identify relevant studies. It involves scrutinizing scientific databases and all relevant articles in journals. Plus, seek suggestions from domain experts and review reference lists of relevant review articles.

Screening and selecting studies

Employ predefined inclusion and exclusion criteria to systematically screen the identified studies. This screening process also typically involves multiple reviewers independently assessing the eligibility of each study.

Data extraction

Extract key information from selected studies using standardized forms or protocols. It includes study characteristics, methods, results, and conclusions.

Critical appraisal

Evaluate the methodological quality and potential biases of included studies. Various tools (BMC medical research methodology) and criteria can be implemented for critical evaluation depending on the study design and research quetions .

Data synthesis

Analyze and synthesize review findings from individual studies to draw encompassing conclusions or identify overarching patterns and explore heterogeneity among studies.

Interpretation and conclusion

Interpret the findings about the research question, considering the strengths and limitations of the research evidence. Draw conclusions and implications for further research.

The final step — Report writing

Craft a detailed report of the systematic literature review adhering to the established guidelines of PRISMA (Preferred Reporting Items for Systematic Reviews and Meta-Analyses). This ensures transparency and reproducibility of the review process.

By following these steps, a systematic literature review aims to provide a comprehensive and unbiased summary of existing evidence, help make informed decisions, and advance knowledge in the respective domain or field.

Structure of a systematic literature review

A well-structured systematic literature review typically consists of the following sections:

• Introduction: Provides background information on the research topic, outlines the review objectives, and enunciates the scope of the study.
• Methodology: Describes the literature search strategy, selection criteria, data extraction process, and other methods used for data synthesis, extraction, or other data analysis..
• Results: Presents the review findings, including a summary of the incorporated studies and their key findings.
• Discussion: Interprets the findings in light of the review objectives, discusses their implications, and identifies limitations or promising areas for future research.
• Conclusion: Summarizes the main review findings and provides suggestions based on the evidence presented in depth meta analysis.

*Important (applies to all the reviews): Remember, the specific structure of your literature review may vary depending on your topic, research question, and intended audience. However, adhering to a clear and logical hierarchy ensures your review effectively analyses and synthesizes knowledge and contributes valuable insights for readers.

Pros and Cons of Systematic Literature Review

• Adopts rigorous and transparent methodology
• Minimizes bias and enhances the reliability of the study
• Provides evidence-based insights
• Time and resource-intensive
• High dependency on the quality of available literature (literature research strategy should be accurate)
• Potential for publication bias

Example of Well-Executed Systematic Literature Review

Paper title: Systematic Reviews: Understanding the Best Evidence For Clinical Decision-making in Health Care: Pros and Cons.

Read this detailed article on how to use AI tools to conduct a systematic review for your research!

3. Scoping Literature Review

A scoping literature review is a methodological review type of literature review that adopts an iterative approach to systematically map the existing literature on a particular topic or research area. It involves identifying, selecting, and synthesizing relevant papers to provide an overview of the size and scope of available evidence. Scoping reviews are broader in scope and include a diverse range of study designs and methodologies especially focused on health services research.

The main purpose of a scoping literature review is to examine the extent, range, and nature of existing studies on a topic, thereby identifying gaps in research, inconsistencies, and areas for further investigation. Additionally, scoping reviews can help researchers identify suitable methodologies and formulate clinical recommendations. They also act as the frameworks for future systematic reviews or primary research studies.

Scoping reviews are primarily focused on —

• Emerging or evolving topics — where the research landscape is still growing or budding. Example — Whole Systems Approaches to Diet and Healthy Weight: A Scoping Review of Reviews .
• Broad and complex topics : With a vast amount of existing literature.
• Scenarios where a systematic review is not feasible: Due to limited resources or time constraints.

Steps to Conduct a Scoping Literature Review

While Scoping reviews are not as rigorous as systematic reviews, however, they still follow a structured approach. Here are the steps:

Identify the research question: Define the broad topic you want to explore.

Identify Relevant Studies: Conduct a comprehensive search of relevant literature using appropriate databases, keywords, and search strategies.

Select studies to be included in the review: Based on the inclusion and exclusion criteria, determine the appropriate studies to be included in the review.

Data extraction and charting : Extract relevant information from selected studies, such as year, author, main results, study characteristics, key findings, and methodological approaches.  However, it varies depending on the research question.

Collate, summarize, and report the results: Analyze and summarize the extracted data to identify key themes and trends. Then, present the findings of the scoping review in a clear and structured manner, following established guidelines and frameworks .

Structure of a Scoping Literature Review

A scoping literature review typically follows a structured format similar to a systematic review. It includes the following sections:

• Introduction: Introduce the research topic and objectives of the review, providing the historical context, and rationale for the study.
• Methods : Describe the methods used to conduct the review, including search strategies, study selection criteria, and data extraction procedures.
• Results: Present the findings of the review, including key themes, concepts, and patterns identified in the literature review.
• Discussion: Examine the implications of the findings, including strengths, limitations, and areas for further examination.
• Conclusion: Recapitulate the main findings of the review and their implications for future research, policy, or practice.

Pros and Cons of Scoping Literature Review

• Provides a comprehensive overview of existing literature
• Helps to identify gaps and areas for further research
• Suitable for exploring broad or complex research questions
• Doesn’t provide the depth of analysis offered by systematic reviews
• Subject to researcher bias in study selection and data extraction
• Requires careful consideration of literature search strategies and inclusion criteria to ensure comprehensiveness and validity.

In short, a scoping review helps map the literature on developing or emerging topics and identifying gaps. It might be considered as a step before conducting another type of review, such as a systematic review. Basically, acts as a precursor for other literature reviews.

Example of a Well-Executed Scoping Literature Review

Paper title: Health Chatbots in Africa Literature: A Scoping Review

Check out the key differences between Systematic and Scoping reviews — Evaluating literature review: systematic vs. scoping reviews

4. Integrative Literature Review

Integrative Literature Review (ILR) is a type of literature review that proposes a distinctive way to analyze and synthesize existing literature on a specific topic, providing a thorough understanding of research and identifying potential gaps for future research.

Unlike a systematic review, which emphasizes quantitative studies and follows strict inclusion criteria, an ILR embraces a more pliable approach. It works beyond simply summarizing findings — it critically analyzes, integrates, and interprets research from various methodologies (qualitative, quantitative, mixed methods) to provide a deeper understanding of the research landscape. ILRs provide a holistic and systematic overview of existing research, integrating findings from various methodologies. ILRs are ideal for exploring intricate research issues, examining manifold perspectives, and developing new research questions.

Steps to Conduct an Integrative Literature Review

• Identify the research question: Clearly define the research question or topic of interest as formulating a clear and focused research question is critical to leading the entire review process.
• Literature search strategy: Employ systematic search techniques to locate relevant literature across various databases and sources.
• Evaluate the quality of the included studies : Critically assess the methodology, rigor, and validity of each study by applying inclusion and exclusion criteria to filter and select studies aligned with the research objectives.
• Data Extraction: Extract relevant data from selected studies using a structured approach.
• Synthesize the findings : Thoroughly analyze the selected literature, identify key themes, and synthesize findings to derive noteworthy insights.
• Critical appraisal: Critically evaluate the quality and validity of qualitative research and included studies by using BMC medical research methodology.
• Interpret and present your findings: Discuss the purpose and implications of your analysis, spotlighting key insights and limitations. Organize and present the findings coherently and systematically.

Structure of an Integrative Literature Review

• Introduction : Provide an overview of the research topic and the purpose of the integrative review.
• Methods: Describe the opted literature search strategy, selection criteria, and data extraction process.
• Results: Present the synthesized findings, including key themes, patterns, and contradictions.
• Discussion: Interpret the findings about the research question, emphasizing implications for theory, practice, and prospective research.
• Conclusion: Summarize the main findings, limitations, and contributions of the integrative review.

Pros and Cons of Integrative Literature Review

• Informs evidence-based practice and policy to the relevant stakeholders of the research.
• Contributes to theory development and methodological advancement, especially in the healthcare arena.
• Integrates diverse perspectives and findings
• Time-consuming process due to the extensive literature search and synthesis
• Requires advanced analytical and critical thinking skills
• Potential for bias in study selection and interpretation
• The quality of included studies may vary, affecting the validity of the review

Example of Integrative Literature Reviews

Paper Title: An Integrative Literature Review: The Dual Impact of Technological Tools on Health and Technostress Among Older Workers

5. Rapid Literature Review

A Rapid Literature Review (RLR) is the fastest type of literature review which makes use of a streamlined approach for synthesizing literature summaries, offering a quicker and more focused alternative to traditional systematic reviews. Despite employing identical research methods, it often simplifies or omits specific steps to expedite the process. It allows researchers to gain valuable insights into current research trends and identify key findings within a shorter timeframe, often ranging from a few days to a few weeks — unlike traditional literature reviews, which may take months or even years to complete.

When to Consider a Rapid Literature Review?

• When time impediments demand a swift summary of existing research
• For emerging topics where the latest literature requires quick evaluation
• To report pilot studies or preliminary research before embarking on a comprehensive systematic review

Steps to Conduct a Rapid Literature Review

• Define the research question or topic of interest. A well-defined question guides the search process and helps researchers focus on relevant studies.
• Determine key databases and sources of relevant literature to ensure comprehensive coverage.
• Develop literature search strategies using appropriate keywords and filters to fetch a pool of potential scientific articles.
• Screen search results based on predefined inclusion and exclusion criteria.
• Extract and summarize relevant information from the above-preferred studies.
• Synthesize findings to identify key themes, patterns, or gaps in the literature.
• Prepare a concise report or a summary of the RLR findings.

Structure of a Rapid Literature Review

An effective structure of an RLR typically includes the following sections:

• Introduction: Briefly introduce the research topic and objectives of the RLR.
• Methodology: Describe the search strategy, inclusion and exclusion criteria, and data extraction process.
• Results: Present a summary of the findings, including key themes or patterns identified.
• Discussion: Interpret the findings, discuss implications, and highlight any limitations or areas for further research
• Conclusion: Summarize the key findings and their implications for practice or future research

Pros and Cons of Rapid Literature Review

• RLRs can be completed quickly, authorizing timely decision-making
• RLRs are a cost-effective approach since they require fewer resources compared to traditional literature reviews
• Offers great accessibility as RLRs provide prompt access to synthesized evidence for stakeholders
• RLRs are flexible as they can be easily adapted for various research contexts and objectives
• RLR reports are limited and restricted, not as in-depth as systematic reviews, and do not provide comprehensive coverage of the literature compared to traditional reviews.
• Susceptible to bias because of the expedited nature of RLRs. It would increase the chance of overlooking relevant studies or biases in the selection process.
• Due to time constraints, RLR findings might not be robust enough as compared to systematic reviews.

Example of a Well-Executed Rapid Literature Review

Paper Title: What Is the Impact of ChatGPT on Education? A Rapid Review of the Literature

A Summary of Literature Review Types

Tools and Resources for Conducting Different Types of Literature Reviews

Online scientific databases.

Platforms such as SciSpace , PubMed , Scopus , Elsevier , and Web of Science provide access to a vast array of scholarly literature, facilitating the search and data retrieval process.

Reference management software

Tools like SciSpace Citation Generator , EndNote, Zotero , and Mendeley assist researchers in organizing, annotating, and citing relevant literature, streamlining the review process altogether.

Automate Literature Review with AI tools

Automate the literature review process by using tools like SciSpace literature review which helps you compare and contrast multiple papers all on one screen in an easy-to-read matrix format. You can effortlessly analyze and interpret the review findings tailored to your study. It also supports the review in 75+ languages, making it more manageable even for non-English speakers.

Goes without saying — literature review plays a pivotal role in academic research to identify the current trends and provide insights to pave the way for future research endeavors. Different types of literature review has their own strengths and limitations, making them suitable for different research designs and contexts. Whether conducting a narrative review, systematic review, scoping review, integrative review, or rapid literature review, researchers must cautiously consider the objectives, resources, and the nature of the research topic.

If you’re currently working on a literature review and still adopting a manual and traditional approach, switch to the automated AI literature review workspace and transform your traditional literature review into a rapid one by extracting all the latest and relevant data for your research!

There you go!

Frequently Asked Questions

Narrative reviews give a general overview of a topic based on the author's knowledge. They may lack clear criteria and can be biased. On the other hand, systematic reviews aim to answer specific research questions by following strict methods. They're thorough but time-consuming.

A systematic review collects and analyzes existing research to provide an overview of a topic, while a meta-analysis statistically combines data from multiple studies to draw conclusions about the overall effect of an intervention or relationship between variables.

A systematic review thoroughly analyzes existing research on a specific topic using strict methods. In contrast, a scoping review offers a broader overview of the literature without evaluating individual studies in depth.

A systematic review thoroughly examines existing research using a rigorous process, while a rapid review provides a quicker summary of evidence, often by simplifying some of the systematic review steps to meet shorter timelines.

A systematic review carefully examines many studies on a single topic using specific guidelines. Conversely, an integrative review blends various types of research to provide a more comprehensive understanding of the topic.

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What is a Living Literature Review?

Table of contents.

The number of academic papers doubles every 12 years. This wealth of new knowledge is exciting, but the pace of growth makes keeping up with the latest developments increasingly difficult.

One response to this challenge is “living literature reviews”. At Open Phil, we define a living literature review as a continuously updated online collection of accessible articles that synthesize academic research on a specific topic. These reviews are primarily written by a single expert who is responsible for its quality and accuracy.

Living literature reviews aim to be accessible to readers unfamiliar with a field while maintaining rigor. Unlike news articles that often focus on single, sensational studies, these reviews provide a broader perspective, synthesizing findings from multiple sources. They differ from traditional academic literature reviews by avoiding paywalls, dense jargon, and lengthy formats that pose barriers to non-specialists. Moreover, because they don’t assume familiarity with the assumptions of a field, living literature reviews aim to describe how conclusions were reached, not just what the conclusions are. This transparency allows readers to better understand the research methodology and form their own judgment on the strength of the findings.

Living literature reviews also help readers assess a field by relying on a single individual to provide a consistent voice, perspective, and expert curatorial taste. While these individuals collaborate with other experts in their fields, having one consistent author allows readers to gauge how much they trust the author’s judgment over time.

Finally, living literature reviews leverage digital platforms for hosting and distribution. Websites allow for post-publication corrections and updates, enabling a level of currency that traditional print reviews can’t match. Complementing these, email newsletters and podcasts extend the reach and convenience of learning about academic research.

By making research accessible to a broader audience, living literature reviews can facilitate interdisciplinary connections and inform policy work. They offer insights into work happening in adjacent fields, potentially inspiring collaborations and novel research directions.

Open Philanthropy supports several living literature reviews:

• New Things Under the Sun by Matt Clancy: social science research on science and innovation
• Existential Crunch by Florian Jehn: academic literature on societal collapse
• Some Are Useful by Tom Gebhart: how AI and machine learning are used in different parts of science
• Good Questions Review by Paul Kellner: the relationship between academic research and policy impact

We are now seeking pre-proposals from individuals to write living literature reviews . We are particularly interested in reviews on neglected topics relevant to policymaking. Ideal candidates will have a PhD or equivalent expertise in their proposed area. Our support typically allows authors to dedicate a quarter to a third of their time to the project.

If you’re interested in launching your own living literature review, we encourage you to reach out. For more information on how to submit a pre-proposal, please contact [email protected] .

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A systematic literature review of the clinical and socioeconomic burden of bronchiectasis

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Background The overall burden of bronchiectasis on patients and healthcare systems has not been comprehensively described. Here, we present the findings of a systematic literature review that assessed the clinical and socioeconomic burden of bronchiectasis with subanalyses by aetiology (PROSPERO registration: CRD42023404162).

Methods Embase, MEDLINE and the Cochrane Library were searched for publications relating to bronchiectasis disease burden (December 2017–December 2022). Journal articles and congress abstracts reporting on observational studies, randomised controlled trials and registry studies were included. Editorials, narrative reviews and systematic literature reviews were included to identify primary studies. PRISMA guidelines were followed.

Results 1585 unique publications were identified, of which 587 full texts were screened and 149 were included. A further 189 citations were included from reference lists of editorials and reviews, resulting in 338 total publications. Commonly reported symptoms and complications included dyspnoea, cough, wheezing, sputum production, haemoptysis and exacerbations. Disease severity across several indices and increased mortality compared with the general population was reported. Bronchiectasis impacted quality of life across several patient-reported outcomes, with patients experiencing fatigue, anxiety and depression. Healthcare resource utilisation was considerable and substantial medical costs related to hospitalisations, treatments and emergency department and outpatient visits were accrued. Indirect costs included sick pay and lost income.

Conclusions Bronchiectasis causes significant clinical and socioeconomic burden. Disease-modifying therapies that reduce symptoms, improve quality of life and reduce both healthcare resource utilisation and overall costs are needed. Further systematic analyses of specific aetiologies and paediatric disease may provide more insight into unmet therapeutic needs.

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Bronchiectasis imposes a significant clinical and socioeconomic burden on patients, their families and employers, and on healthcare systems. Therapies that reduce symptoms, improve quality of life and reduce resource use and overall costs are needed. https://bit.ly/4bPCHlp

• Introduction

Bronchiectasis is a heterogeneous chronic respiratory disease clinically characterised by chronic cough, excessive sputum production and recurrent pulmonary exacerbations [ 1 ], and radiologically characterised by the abnormal widening of the bronchi [ 2 ]. Bronchiectasis is associated with several genetic, autoimmune, airway and infectious disorders [ 3 ]. Regardless of the underlying cause, the defining features of bronchiectasis are chronic airway inflammation and infection, regionally impaired mucociliary clearance, mucus hypersecretion and mucus obstruction, as well as progressive structural lung damage [ 4 , 5 ]. These features perpetuate one another in a “vicious vortex” leading to a decline in lung function, pulmonary exacerbations and associated morbidity, mortality and worsened quality of life [ 4 , 5 ]. Bronchiectasis can be further categorised into several infective and inflammatory endotypes and is associated with multiple comorbidities and underlying aetiologies [ 6 ].

Bronchiectasis has been described as an emerging global epidemic [ 7 ], with prevalence and incidence rates increasing worldwide [ 8 – 12 ]. The prevalence of bronchiectasis, as well as of the individual aetiologies, varies widely across geographic regions [ 13 ]. In Europe, the reported prevalence ranges from 39.1 (females) and 33.3 (males) cases per 100 000 inhabitants in Spain and 68 (females) and 65 (males) cases per 100 000 inhabitants in Germany, to as high as 566 cases (females) and 486 cases (males) per 100 000 inhabitants in the UK [ 10 – 12 ]. In the US, the average overall prevalence was reported to be 139 cases per 100 000 [ 14 ], in Israel, the prevalence was reported to be 234 cases per 100 000 [ 15 ], and in China the prevalence was reported to be 174 per 100 000 [ 8 ]. Studies show that bronchiectasis prevalence increases with age [ 14 ]. This may increase the socioeconomic impact of bronchiectasis on countries with disproportionately higher number of older citizens. Large registry studies in patients with bronchiectasis have been published from the US (Bronchiectasis Research Registry) [ 16 ], Europe and Israel (European Multicentre Bronchiectasis Audit and Research Collaboration (EMBARC)); the largest and most comprehensive report available to date) [ 17 ], India (EMBARC-India) [ 18 , 19 ], Korea (Korean Multicentre Bronchiectasis Audit and Research Collaboration) [ 20 ] and Australia (Australian Bronchiectasis Registry) [ 21 ].

Although there are currently no approved disease-modifying therapies for bronchiectasis [ 4 ], comprehensive clinical care recommendations for the management of patients with bronchiectasis have been published [ 22 , 23 ]. However, the burden that bronchiectasis imposes on patients and their families, as well as on healthcare systems, payers and employers, remains poorly understood. No review to date has used a systematic method to evaluate the overall disease burden of bronchiectasis. This is the first systematic literature review aimed at investigating and synthesising the clinical and socioeconomic burden of bronchiectasis. A better understanding of the overarching burden of bronchiectasis, both overall and by individual aetiologies and associated diseases, will highlight the need for new therapies and assist healthcare systems in planning care and required resources.

The protocol of this systematic review was registered on PROSPERO (reference number: CRD42023404162).

Search strategy

This systematic literature review was conducted according to the Preferred Reporting Items for Systematic Review and Meta-Analyses (PRISMA) guidelines [ 24 ]. Embase, MEDLINE and the Cochrane Library were searched for studies related to the clinical and socioeconomic burden of bronchiectasis (noncystic fibrosis bronchiectasis (NCFBE) and cystic fibrosis bronchiectasis (CFBE)) using the search terms available in supplementary table S1 . Articles written in English and published over a 5-year period (December 2017–December 2022) were included.

Selection criteria

The following article types reporting on prospective and retrospective observational studies, registry studies and randomised controlled trials (only baseline data extracted) were included: journal articles, preprints, research letters, conference proceedings, conference papers, conference abstracts, meeting abstracts and meeting posters. Reviews, literature reviews, systematic reviews and meta-analyses, as well as editorials, commentaries, letters and letters to the editor, were included for the purpose of identifying primary studies. A manual search of references cited in selected articles was performed and references were only included if they were published within the 5 years prior to the primary article being published.

Screening and data extraction

A reviewer screened all titles and abstracts to identify publications for full-text review. These publications then underwent full-text screening by the same reviewer for potential inclusion. A second reviewer independently verified the results of both the title/abstract screen and the full-text screen. Any discrepancies were resolved by a third independent reviewer. Data relating to aetiology, symptoms, disease severity, exacerbations, lung function, infection, comorbidities, patient-reported outcomes (PROs), exercise capacity, mortality, impact on family and caregivers, healthcare resource utilisation (HCRU), treatment burden, medical costs, and indirect impacts and costs, as well as data relating to the patient population, study design, sample size and country/countries of origin, were extracted from the final set of publications into a standardised Excel spreadsheet by one reviewer. Studies were grouped based on the burden measure, and aggregate data (range of reported values) were summarised in table or figure format. For the economic burden section, costs extracted from studies reporting in currencies other than the euros were converted to euros based on the average exchange rate for the year in which the study was conducted.

Data from patients with specific bronchiectasis aetiologies and in children (age limits varied from study to study and included upper age limits of 15, 18, 19 and 20 years) were reported separately, where available. As literature relating to NCFBE and CFBE is generally distinct, any data related to CFBE are reported separately in the tables and text. We conducted subanalyses of key disease burden indicators, in which we extracted data from multicentre studies or those with a sample size >1000 subjects, to try to identify estimates from the most representative datasets. These data from larger and multicentre studies are reported in square brackets in tables 1 – 3 and supplementary tables S2–S7 , where available.

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Prevalence and severity of bronchiectasis symptoms overall, in children, during exacerbations and in individual bronchiectasis aetiologies

Patient-reported outcome scores in patients with bronchiectasis overall and in individual bronchiectasis aetiologies

Healthcare resource utilisation (HCRU) in patients with bronchiectasis overall and in individual bronchiectasis aetiologies

Given the nature of the data included in this systematic literature review (that is, a broad range of patient clinical and socioeconomic characteristics rather than the outcome(s) of an intervention), in addition to the broad range of study types included, meta-analyses to statistically combine data of similar studies were not deemed appropriate and therefore not performed.

Summary of included studies

A total of 1834 citations were retrieved from the Embase, MEDLINE and Cochrane Library databases, of which 1585 unique citations were identified. Abstract/title screening led to the inclusion of 587 citations for full-text screening. Following full-text screening, 149 primary citations and 110 literature reviews, systematic reviews and meta-analyses as well as editorials and letters to the editor remained. From the reference lists of these 110 citations, a further 189 primary citations were identified. These articles were only included if 1) the primary articles contained data relating to the burden of bronchiectasis and 2) the primary articles were published within the 5 years prior to the original article's publication date. In total, 338 publications were considered eligible and included in this review ( supplementary figure S1 ). This included 279 journal articles, 46 congress abstracts and 13 letters to the editor or scientific/research letters. The results are summarised in the sections below. For the results from individual studies, including a description of the patient population, study design, sample size and country/countries of origin, please see the supplemental Excel file .

The most frequently reported aetiologies included post-infectious, genetic (primary ciliary dyskinesia (PCD), alpha-1 antitrypsin deficiency (AATD) and cystic fibrosis (CF)), airway diseases (COPD and asthma), allergic bronchopulmonary aspergillosis (ABPA), aspiration and reflux-related, immunodeficiency and autoimmune aetiologies ( supplementary figure S2 ). However, in up to 80.7% of adult cases and 53.3% of paediatric cases, the aetiology was not determined (referred to as “idiopathic bronchiectasis”) ( supplementary figure S2 ). When limited to larger or multicentre studies, the frequency of idiopathic bronchiectasis ranged from 11.5 to 66.0% in adults and from 16.5 to 29.4% in children. Further details and additional aetiologies can be seen in the supplemental Excel file .

Clinical burden

Symptom burden and severity.

Commonly reported symptoms in patients with bronchiectasis included cough, sputum production, dyspnoea, wheezing and haemoptysis, with these symptoms more prevalent in adults compared with children ( table 1 ). Other reported symptoms included chest discomfort, pain or tightness (both generally and during an exacerbation), fever and weight loss in both adults and children, and fatigue, tiredness or asthenia, appetite loss, and sweating in adults. In children, respiratory distress, hypoxia during an exacerbation, sneezing, nasal and ear discharge, thriving poorly including poor growth and weight loss, exercise intolerance, malaise, night sweats, abdominal pain, recurrent vomiting, and diarrhoea were reported ( supplemental Excel file ). Classic bronchiectasis symptoms such as sputum production (range of patients reporting sputum production across all studies: 22.0–92.7%) and cough (range of patients reporting cough across all studies: 24.0–98.5%) were not universally reported ( table 1 ).

In a study comparing bronchiectasis (excluding CFBE) in different age groups (younger adults (18–65 years), older adults (66–75 years) and elderly adults (≥76 years) [ 63 ]), no significant differences across age groups were reported for the presence of cough (younger adults: 73.9%; older adults: 72.8%; elderly adults: 72.9%; p=0.90), sputum production (younger adults: 57.8%; older adults: 63.8%; elderly adults: 6.0%; p=0.16) or haemoptysis (younger adults: 16.5%; older adults: 19.3%; elderly adults: 16.3%; p=0.47).

Disease severity

Disease severity was reported according to several measures including the bronchiectasis severity index (BSI), the forced expiratory volume in 1 s (FEV 1 ), Age, Chronic Colonisation, Extension, Dyspnoea (FACED) score and the Exacerbations-FACED (E-FACED) score, all of which are known to be associated with future exacerbations, hospitalisations and mortality ( supplementary table S2 and the supplemental Excel file ). Up to 78.7, 41.8 and 40.8% of patients with bronchiectasis reported severe disease according to the BSI, FACED score and E-FACED score, respectively ( supplementary table S2 ). In most studies, severity scores were greater among people with bronchiectasis secondary to COPD or post-tuberculosis (TB) than idiopathic bronchiectasis ( supplementary table S2 ). No data relating to disease severity were reported for CFBE specifically.

Exacerbations

The number of exacerbations experienced by patients with bronchiectasis in the previous year, per year and during follow-up are presented in figure 1 . For further details, please see the supplemental Excel file . Two studies reported exacerbation length in patients with bronchiectasis; this ranged from 11 to 16 days (both small studies; sample sizes of 191 and 32, respectively) [ 25 , 64 ]. A study in children with NCFBE reported a median of one exacerbation in the previous year. Additionally, the same study reported that 31.1% of children with bronchiectasis experienced ≥3 exacerbations per year [ 65 ].

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Range of bronchiectasis exacerbations in the previous year, per year and in the first and second years of follow-up. # : Two studies reported significant differences in the number of exacerbations experienced in the previous year across individual aetiologies. Study 1 [ 90 ]: Patients with idiopathic bronchiectasis had significantly fewer exacerbations in the previous year compared with other aetiologies (primary ciliary dyskinesia (PCD), COPD and post-infectious) (p<0.021). Study 2 [ 33 ]: significant difference between post-tuberculosis (TB) bronchiectasis (mean: 2.8) and other aetiologies excluding idiopathic bronchiectasis (mean: 1.7) (p<0.05).

Lung function

Reduced lung function was reported across several different measures in adults and children with bronchiectasis overall, including FEV 1 (absolute values and % predicted), forced vital capacity (FVC; absolute values and % pred) and lung clearance index (adults only) ( supplementary table S3 and the supplemental Excel file ). In most studies, lung function was lowest among people with post-TB bronchiectasis and bronchiectasis secondary to COPD or PCD ( supplementary table S2 ). Additional measures of lung function are detailed in the supplemental Excel file . Lung clearance index, considered more sensitive than spirometry to early airway damage, was elevated in two studies in adults with bronchiectasis, with a range of 9.0–12.8 (normal: 6–7 or less) [ 66 , 67 ].

In a study comparing bronchiectasis (people with CFBE excluded) in different age groups, elderly adults (≥76 years) had significantly lower FEV 1 % pred (median: 67) compared with both younger (18–65 years; median: 78) and older adults (66–75 years; median: 75) (p<0.017 for both comparisons) [ 63 ]. FVC % pred was found to be significantly lower in elderly adults (mean: 65) compared with both younger adults (median: 78) and older adults (median: 75) (p<0.017 for both comparisons) [ 63 ].

Chronic infection with at least one pathogen was reported in 22.3–79.6% of patients with bronchiectasis, although each study defined chronic infection differently (number of studies: 20). When limited to larger or multicentre studies, chronic infection with at least one pathogen was reported in 10.7–54.5% of patients with bronchiectasis (number of studies: 12). In two studies in NCFBE, significant differences in the proportion of patients chronically infected with at least one pathogen were reported across aetiologies (p<0.001 for both studies) [ 68 , 69 ]. Patients with post-infectious (other than TB) bronchiectasis (34.9%) [ 68 ] and patients with PCD-related bronchiectasis (68.3%) [ 69 ] had the highest prevalence of chronic infection.

The most commonly reported bacterial and fungal pathogens are shown in supplementary table S4 . The two most common bacterial pathogens were Pseudomonas ( P .) aeruginosa and Haemophilus ( H. ) influenzae . In several studies, more patients with PCD, TB and COPD as the aetiology of their bronchiectasis reported infection with P. aeruginosa . Additionally, in one study, significantly more children with CFBE had P. aeruginosa infection compared with children with NCFBE [ 70 ]. Further details and additional pathogens are reported in the supplemental Excel file .

Diversity of the sputum microbiome was assessed in two studies. In the first study in people with bronchiectasis (people with CFBE excluded), reduced microbiome alpha diversity (defined as the relative abundance of microbial species within a sample), particularly associated with Pseudomonas or Proteobacteria dominance, was associated with greater disease severity, increased frequency and severity of exacerbations, and a higher risk of mortality [ 71 ]. In the second study (unknown whether people with CFBE were excluded), a lower Shannon–Wiener diversity index (a measure of species diversity, with lower scores indicating lower diversity) score was associated with multiple markers of disease severity, including a higher BSI score (p=0.0003) and more frequent exacerbations (p=0.008) [ 72 ].

In a study comparing bronchiectasis (people with CFBE excluded) in different age groups (younger adults: 18–65 years; older adults: 66–75 years; elderly adults: ≥76 years) [ 63 ], chronic infection with H. influenzae was reported in 18.3% of younger adults, 12.8% of older adults and 8.8% of elderly adults, and chronic infection with Streptococcus ( Str. ) pneumoniae was reported in 5.3% of younger adults, 2.8% of older adults and 1.3% of elderly adults. For both of the above, the prevalence was significantly higher in younger adults compared with elderly adults (p<0.017 for both comparisons). However, no significant differences across age groups were reported for P. aeruginosa , Moraxella catarrhalis or Staphylococcus ( Sta .) aureus chronic infection.

P. aeruginosa infection was significantly associated with reduced FEV 1 [ 73 ], more severe disease [ 74 ], more frequent exacerbations [ 35 , 49 , 75 , 76 ], increased hospital admissions, reduced quality of life based on St. George's Respiratory Questionnaire (SGRQ) and increased and 4-year mortality [ 49 , 76 ]. Additionally, in a study reporting healthcare use and costs in the US between 2007–2013, healthcare costs and hospitalisation costs were found to be increased in patients infected with P. aeruginosa ($56 499 and $41 972 more than patients not infected with P. aeruginosa , respectively) [ 77 ]. In the same study, HCRU was also higher in patients infected with P. aeruginosa (fivefold increase in the number of hospitalisations and 84% more emergency department (ED) visits compared with patients not infected with P. aeruginosa ) [ 77 ].

Comorbidities

The most frequently reported comorbidities included cardiovascular (including heart failure, cerebrovascular disease and hypertension), respiratory (including asthma, COPD and sinusitis), metabolic (including diabetes and dyslipidaemia), malignancy (including haematological and solid malignancies), bone and joint-related (including osteoporosis and rheumatological disease), neurological (including anxiety and depression), renal, hepatic, and gastrointestinal comorbidities ( supplementary table S5 ). No data relating to comorbidities were reported for CFBE specifically. For further details and additional comorbidities, please see the supplemental Excel file .

In a study comparing bronchiectasis (people with CFBE excluded) in different age groups (younger adults: 18–65 years; older adults: 66–75 years; elderly adults: ≥76 years), younger adults had a significantly lower prevalence of diabetes compared with older adults, a significantly lower prevalence of stroke compared with elderly adults and a significantly lower prevalence of heart failure, solid tumours and renal failure compared with both older and elderly adults (p<0.0017 for all comparisons). Additionally, the prevalence of COPD was significantly lower in both younger and older adults compared with elderly adults (p<0.017) [ 63 ]. In studies reporting in children with bronchiectasis, the prevalence of comorbid asthma ranged from 22.2 to 25.8% [ 65 , 78 ] and the prevalence of sinusitis was reported to be 12.7% in a single study [ 79 ].

Charlson comorbidity index (CCI)

CCI scores can range from 0 to 37, with higher scores indicating a decreased estimate of 10-year survival. In this review, CCI scores ranged from 0.7 to 6.6 in studies reporting means (number of studies: 7). In one study, adults with bronchiectasis (people with CFBE excluded) who experienced ≥2 exacerbations per year were found to have significantly higher CCI scores (3.3) compared with patients who experienced less than two exacerbations per year (2.2) (p=0.001) [ 35 ]. In another study in adults with bronchiectasis (people with CFBE excluded), CCI scores increased significantly with increasing disease severity, with patients with mild (FACED score of 0–2), moderate (FACED score of 3–4) and severe (FACED score of 5–7) bronchiectasis reporting mean CCI scores of 3.9, 5.7 and 6.3, respectively [ 80 ]. No CCI scores were reported for CFBE specifically.

Prevalence of comorbidities in patients with bronchiectasis compared with control individuals

Several studies reported a higher prevalence of cardiovascular comorbidities. such as heart failure [ 81 ], stroke [ 82 , 83 ] and hypertension [ 82 – 84 ] in patients with bronchiectasis compared with a matched general population or healthy controls. Conversely, several additional studies reported no significant differences [ 81 , 85 , 86 ]. Two large studies reported an increased prevalence of diabetes in patients with bronchiectasis compared with nonbronchiectasis control groups [ 83 , 84 ]; however, three additional smaller studies reported no significant differences [ 81 , 82 , 86 ]. The prevalence of gastro–oesophageal reflux disease was found to be significantly higher in patients with bronchiectasis compared with matched nonbronchiectasis controls in one study [ 87 ], but no significant difference was reported in a second study [ 85 ]. Both anxiety and depression were found to be significantly more prevalent in patients with bronchiectasis compared with matched healthy controls in one study [ 55 ]. Lastly, two large studies reported an increased prevalence of asthma [ 84 , 87 ] and five studies reported a significantly higher prevalence of COPD [ 81 , 82 , 84 , 85 , 87 ] in patients with bronchiectasis compared with matched nonbronchiectasis controls or the general population. A smaller study reported conflicting evidence whereby no significant difference in the prevalence of asthma in patients with bronchiectasis compared with matched controls was reported [ 85 ].

Socioeconomic burden

Patient-reported outcomes.

Health-related quality of life (HRQoL), fatigue, anxiety and depression were reported across several PRO measures and domains. The most frequently reported PROs are discussed in further detail in the sections below ( table 2 ). Further details and additional PROs can be seen in the supplemental Excel file .

In a study comparing bronchiectasis (people with CFBE excluded) in different age groups (younger adults: 18–65 years; older adults: 66–75 years; elderly adults: ≥76 years), the median SGRQ total score was significantly higher in elderly adults (50.8) compared with younger adults (36.1), indicating a higher degree of limitation (p=0.017) [ 63 ].

In a study that reported Leicester Cough Questionnaire (LCQ) scores in men and women with bronchiectasis (people with CFBE excluded) separately, women had significantly lower LCQ total scores (14.9) when compared with men (17.5) (p=0.006), indicating worse quality of life [ 88 ]. Additionally, women had significantly lower scores across all three LCQ domains (p=0.014, p=0.005 and p=0.011 for physical, psychological and social domains, respectively) [ 88 ].

Exercise capacity

Exercise capacity in patients with bronchiectasis was reported using walking tests namely the 6-minute walk test (6MWT) and the incremental shuttle walk test (ISWT) ( supplementary table S6 ). The 6MWT data from patients with bronchiectasis generally fell within the normal range for healthy people; however, the ISWT data was below the normal range for healthy people ( supplementary table S6 ). Studies also reported on daily physical activity, daily sedentary time and number of steps per day in patients with bronchiectasis, and in children specifically ( supplementary table S6 ). No data relating to disease severity were reported for CFBE specifically. Further details can be seen in the supplemental Excel file .

Exercise capacity in patients with bronchiectasis compared with control individuals

In one study, the ISWT distance was reported to be significantly lower in patients with NCFBE compared with healthy controls (592.6 m versus 882.9 m; difference of ∼290 m; p<0.001) [ 89 ]. Additionally, patients with bronchiectasis spent significantly less time on activities of moderate and vigorous intensity compared with healthy controls (p=0.030 and 0.044, respectively) [ 89 ]. Lastly, a study reported that patients with NCFBE had a significantly lower step count per day compared with healthy controls (p<0.001) [ 89 ].

Mortality rate during study period

Mortality ranged from 0.24 to 67.6%; however, it should be noted that the study duration differed across studies. When limited to larger or multicentre studies, the mortality rate ranged from 0.24 to 28.1%. One study reported more deaths in patients with NCFBE (9.1%; 5.9-year mean follow-up period) compared with patients without bronchiectasis (0.8%; 5.4-year mean follow-up period) [ 84 ]. In one study, significantly more patients with COPD-related bronchiectasis died (37.5%) compared with other aetiologies (19.0%) (3.4-year mean follow-up period; p<0.001). After adjusting for several factors, multivariate analysis showed that the diagnosis of COPD as the primary cause of bronchiectasis increased the risk of death by 1.77 compared with the patients with other aetiologies [ 41 ]. Similarly, in another study, COPD-associated bronchiectasis was associated with higher mortality (55%) in multivariate analysis as compared with other aetiologies (rheumatic disease: 20%; post-infectious: 16%; idiopathic: 14%; ABPA: 13%; immunodeficiency: 11%) (hazard ratio 2.12, 95% CI 1.04–4.30; p=0.038; 5.2-year median follow-up period) [ 90 ].

Mortality rates by year

The 1-, 2-, 3-, 4- and 5-year mortality rates in patients with bronchiectasis (people with CFBE excluded, unless unspecified) ranged from 0.0 to 12.3%, 0.0 to 13.0%, 0.0 to 21.0%, 5.5 to 39.1% and 12.4 to 53.0%, respectively (number of studies: 9, 4, 7, 1 and 4, respectively). When limited to larger or multicentre studies, the 1-, 2-, 3- and 5-year mortality rates ranges were 0.4–7.9%, 3.9–13.0%, 3.7–21.0% and 12.4–53.0% (no 4-year mortality data from larger or multicentre studies). No data relating to mortality rates were reported for CFBE specifically.

Two studies reported mortality rate by bronchiectasis aetiology (people with CFBE excluded). In the first study, no significant difference in the 4-year mortality rate was reported across aetiologies (p=0.7; inflammatory bowel disease: 14.3%; post-TB: 13.4%; rheumatoid arthritis: 11.4%; idiopathic or post-infectious: 10.1%; ABPA: 6.1%; other aetiologies: 6.1%) [ 49 ]. In the second study, patients with post-TB bronchiectasis had a significantly higher 5-year mortality rate (30.0%) compared with patients with idiopathic bronchiectasis (18.0%) and other aetiologies (10.0%) (p<0.05 for both comparisons) [ 32 ].

In-hospital and intensive care unit mortality

In-hospital mortality ranged from 2.9 to 59.3% in patients with bronchiectasis (people with CFBE excluded, unless unspecified) hospitalised for an exacerbation or for other reasons (number of studies: 7). When limited to larger or multicentre studies, in-hospital mortality rate was reported in only one study (33.0%). One study reported mortality in bronchiectasis patients admitted to a tertiary care centre according to aetiology; in-hospital mortality was highest in patients with post-pneumonia bronchiectasis (15.8%), followed by patients with idiopathic (7.1%) and post-TB (2.6%) bronchiectasis. No deaths were reported in patients with COPD, ABPA or PCD aetiologies [ 42 ]. Intensive care unit mortality was reported in two studies and ranged from 24.6 to 36.1% [ 62 , 91 ]. No data relating to mortality rates were reported for CFBE specifically.

Impact on family and caregivers

Only two studies discussed the impact that having a child with bronchiectasis has on parents/caregivers. In the first study, parents of children with bronchiectasis (not specified whether children with CFBE were excluded) were more anxious and more depressed according to both the Hospital Anxiety and Depression Scale (HADS) and the Centre of Epidemiological Studies depression scale, compared with parents of children without any respiratory conditions (both p<0.001; sample size of 29 participants) [ 53 ]. In the second study, parents or carers of children with bronchiectasis (multicentre study with a sample size of 141 participants; children with CFBE excluded) were asked to vote for their top five greatest concerns or worries; the most common worries or concerns that were voted for by over 15% of parents were “impact on his/her adult life in the future, long-term effects, normal life” (29.8%), “ongoing declining health” (25.5%), “the cough” (24.8%), “impact on his/her life now as a child (play, development)” (24.1%), “lack of sleep/being tired” (24.1%), “concerns over aspects of antibiotic use” (22.7%), “missing school or daycare” (17.7%) and “breathing difficulties/shortness of breath” (16.3%) [ 92 ].

HCRU in terms of hospitalisations, ED visits, outpatient visits and length of stay overall and by bronchiectasis aetiology are reported in table 3 . No data relating to HCRU were reported for CFBE specifically.

In a study in children with bronchiectasis (children with CFBE excluded), 30.0% of children were hospitalised at least once in the previous year [ 65 ]. The median number of hospitalisations per year was 0 (interquartile range: 0–1) [ 65 ]. In another study, the mean length of hospital stay for children with bronchiectasis was 6.7 days (standard deviation: 4.8 days) [ 93 ]. In a study comparing bronchiectasis (people with CFBE excluded) in different age groups, significantly more elderly adults (≥76 years; 26.0%) were hospitalised at least once during the first year of follow-up compared with younger adults (18–65 years; 17.0%) and older adults (66–75 years; 17.0%) (p<0.017 for both comparisons) [ 63 ]. Additionally, length of stay was found to be significantly longer in male patients (mean: 17.6 days) compared with female patients (mean: 12.5 days) (p=0.03) [ 94 ].

HCRU in patients with bronchiectasis compared with control individuals

Length of stay was found to be 38% higher in patients with bronchiectasis (mean: 15.4 days; people with CFBE excluded) compared with patients with any other respiratory illness (mean: 9.6 days) (p<0.001) [ 94 ]. In a study reporting on HCRU in patients with bronchiectasis (people with CFBE excluded) over a 3-year period (Germany; 2012–2015) [ 85 ], a mean of 24.7 outpatient appointments per patient were reported; there was no significant difference in the number of outpatient appointments between patients with bronchiectasis and matched controls (patients without bronchiectasis matched by age, sex and distribution, and level of comorbidities) (mean: 23.4) (p=0.12). When assessing specific outpatient appointments over the 3-year period, patients with bronchiectasis attended a mean of 9.2 general practitioner appointments, 2.9 radiology appointments, 2.5 chest physician appointments and 0.8 cardiologist appointments. Patients with bronchiectasis had significantly fewer general practitioner appointments compared with matched controls (mean: 9.8) (p=0.002); however, they had significantly more radiology appointments (mean for matched controls: 2.3) and chest physician appointments (mean for matched controls: 1.4) compared with matched controls (p<0.001 for both comparisons).

Hospital admission rates

In England, Wales and Northern Ireland, the crude hospital admission rate in 2013 was 88.4 (95% CI 74.0–105.6) per 100 000 person-years [ 91 ]. In New Zealand (2008–2013), the crude and adjusted hospital admission rates were 25.7 and 20.4 per 100 000 population, respectively [ 95 ]. Lastly, in Australia and New Zealand (2004–2008) the hospital admission rate ranged from 0.7 to 2.9 per person-year [ 96 ]. In all of the abovementioned studies, people with CFBE were excluded.

Treatment burden

In two studies, the percentage of patients with bronchiectasis receiving any respiratory medication at baseline ranged from 60.8 to 85.7% [ 97 , 98 ]. Additionally, in a study comparing healthcare costs in patients with bronchiectasis before and after confirmation of P. aeruginosa infection, mean pharmacy visits in the year preceding diagnosis were reported to be 23.2; this increased significantly by 56.5% to 36.2 in the year post-diagnosis (p<0.0001) [ 99 ]. In another study, patients with bronchiectasis were prescribed a mean of 12 medications for bronchiectasis and other comorbidities [ 100 ]. In all of the abovementioned studies, people with CFBE were excluded. The most frequently reported respiratory treatments can be seen in supplementary table S7 . These included antibiotics (including macrolides), corticosteroids, bronchodilators, mucolytics and oxygen. No treatment data were reported for CFBE specifically. Other respiratory treatments included saline, anticholinergics and leukotriene receptor antagonists ( supplemental Excel file ).

In studies reporting in children with bronchiectasis, 23.9% of children were receiving any bronchodilator at baseline [ 101 ], 9.0–21.7% of children were receiving inhaled corticosteroids (ICS) at baseline [ 101 , 102 ], 4.3% of children were receiving oral corticosteroids at baseline [ 101 ] and 12.1% of children were receiving long-term oxygen therapy [ 103 ].

Medical and nonmedical indirect impacts and costs

Medical costs for bronchiectasis included overall costs, hospitalisation costs, ED visits and outpatient visit costs and costs of treatment; indirect impacts and costs included sick leave and sick pay, missed work and income loss for caregivers, and missed school or childcare for children ( table 4 and the supplemental Excel file ). People with CFBE were excluded from all of the studies in table 4 below. In studies reporting in currencies other than the €, costs were converted to € based on the average exchange rate for the year in which the study was conducted.

Bronchiectasis-related medical costs and indirect impacts and costs (individual studies)

No review to date has systematically evaluated the overall disease burden of bronchiectasis. Here, we present the first systematic literature review that comprehensively describes the clinical and socioeconomic burden of bronchiectasis overall and across individual aetiologies and associated diseases. A total of 338 publications were included in the final analysis. Together, the results indicate that the burden of clinically significant bronchiectasis on patients and their families, as well as on healthcare systems, is substantial, highlighting the urgent need for new disease-modifying therapies for bronchiectasis.

Bronchiectasis is associated with genetic, autoimmune, airway and infectious disorders. However, in many patients with bronchiectasis, an underlying aetiology cannot be identified (idiopathic bronchiectasis) [ 1 , 3 , 4 ]. This is supported by the results of this systematic literature review, in which up to 80.7% of patients were reported to have idiopathic bronchiectasis. The results are in line with those reported in a systematic literature review of bronchiectasis aetiology conducted by G ao et al. [ 13 ] (studies from Asia, Europe, North and South America, Africa and Oceania included) in which an idiopathic aetiology was reported in approximately 45% of patients with bronchiectasis, with a range of 5–82%. The maximum of 80.7% of patients with idiopathic bronchiectasis identified by this systematic literature review is much higher than in the recent report on the disease characteristics of the EMBARC where idiopathic bronchiectasis was the most common aetiology and reported in only ∼38% of patients with bronchiectasis [ 17 ]. This highlights the importance of sample size and geographic variation (80.7% reported from a single-country study with a small sample size versus ∼38% reported from a continent-wide study with a large sample size). Nevertheless, identifying the underlying aetiology is a recommendation of bronchiectasis guidelines as this can considerably alter the clinical management and prognosis [ 23 , 110 ]. Specific therapeutic interventions may be required for specific aetiologies, such as ICS for people with asthma-related bronchiectasis, antifungal treatment for those with ABPA-associated bronchiectasis and immunoglobulin replacement therapy for those with common variable immunodeficiency-related bronchiectasis [ 23 , 111 ]. Indeed, an observational study has shown that identification of the underlying aetiology affected management in 37% of people with bronchiectasis [ 112 ]. Future studies to determine the impact of identifying the underlying aetiology on management and prognosis are needed to fully understand its importance.

Patients with bronchiectasis experienced a significant symptom burden, with dyspnoea, cough, wheezing, sputum production and haemoptysis reported most commonly. These symptoms were also reported in children with bronchiectasis at slightly lower frequencies. Dealing with bronchiectasis symptoms are some of the greatest concerns from a patient's perspective. In a study assessing the aspects of bronchiectasis that patients found most difficult to deal with, sputum, dyspnoea and cough were the first, fifth and sixth most common answers, respectively [ 113 ]. Some aetiologies were reported to have a higher prevalence of certain symptoms. For example, in single studies, patients with PCD-related bronchiectasis were found to have a significantly higher prevalence of cough and wheezing [ 39 ], patients with COPD-related bronchiectasis were found to have a significantly higher prevalence of sputum production [ 41 ], and patients with post-TB bronchiectasis were found to have a higher prevalence of haemoptysis [ 30 ] compared with other aetiologies. Together, these results highlight the need for novel treatments that reduce the symptom burden of bronchiectasis. They also highlight the importance of teaching patients to perform and adhere to regular nonpharmacological interventions, such as airway clearance using physiotherapy techniques, which have been shown to improve cough-related health status and chronic sputum production [ 110 ]. Future studies assessing when airway clearance techniques should be started, and which ones are the most effective, are a research priority [ 113 ].

The burden of exacerbations in patients with bronchiectasis was high, with patients experiencing three or more exacerbations in the previous year (up to 73.6%), per year (up to 55.6%) or in the first year of follow-up (up to 32.4%). Few studies reported significant differences between aetiologies. Importantly, exacerbations are the second-most concerning aspect of bronchiectasis from the patient's perspective [ 113 ]. Patients with frequent exacerbations have more frequent hospitalisations and increased 5-year mortality [ 114 ] and exacerbations are also associated with poorer quality of life [ 114 , 115 ]. Therefore, prevention of exacerbations is of great importance in the management of bronchiectasis [ 116 ]. The exact cause of exacerbations in bronchiectasis (believed to be multifactorial) is not fully understood due a lack of mechanistic studies [ 116 ]. Future studies into the causes and risk factors for exacerbations [ 113 ] may lead to improvements in their prevention.

Many patients with bronchiectasis, including children, experienced chronic infections with bacterial pathogens such as P. aeruginosa , H. influenzae , Sta. aureus and Str. pneumoniae as well as non-tuberculous mycobacteria. Importantly, P. aeruginosa infection was significantly associated with more severe disease, reduced lung function and quality of life, and increased exacerbations, hospital admission, morality, HCRU and healthcare costs. Due to the clear and consistent association between P. aeruginosa and poor outcomes, patients with chronic P. aeruginosa colonisation should be considered to be at a higher risk of bronchiectasis-related complications [ 110 ]. Additionally, regular sputum microbiology screening should be performed in people with clinically significant bronchiectasis to detect new isolation of P. aeruginosa [ 110 ]; in which case, patients should be offered eradication antibiotic treatment [ 23 ]. Eradication of P. aeruginosa is not only of clinical importance, but also of economic importance due to the associated HCRU and healthcare costs. As such, a better understanding of the key factors leading to P. aeruginosa infection is a priority for future research [ 113 ].

Bronchiectasis markedly impacted HRQoL across several PROs including the SGRQ, Quality of Life–Bronchiectasis score, LCQ, COPD Assessment Test and Bronchiectasis Health Questionnaire. In children with bronchiectasis, significantly lower quality of life (according to the Paediatric Quality of Life Inventory score) compared with age-matched controls was reported [ 53 ]. The majority of studies reporting HRQoL in individual aetiologies and associated diseases either reported in a single aetiology, did not perform any statistical analyses to compare aetiologies, or reported no significant differences across aetiologies. Patients also experienced mild-to-moderate anxiety and depression according to the HADS-Anxiety, HADS-Depression and 9-question Patient Health Questionnaire scores, with very limited data reported in individual aetiologies. When compared with healthy controls, anxiety and depression were found to be significantly more prevalent in patients with bronchiectasis [ 55 ]. Additionally, exercise capacity was reduced, with patients with bronchiectasis reported to spend significantly less time on activities of moderate and vigorous intensity and have a significantly lower step count per day compared with healthy controls [ 89 ]. Improvements in anxiety, depression and exercise capacity are important priorities for people with bronchiectasis; in a study assessing the aspects of bronchiectasis that patients found most difficult to manage, “not feeling fit for daily activities”, anxiety and depression were the fourth, eighth and ninth most common answers, respectively [ 113 ].

The studies relating to HCRU and costs in this review were heterogeneous in terms of methodology, time period, country and currency, making them challenging to compare. Nevertheless, this study found that HCRU was substantial, with patients reporting a maximum of 1.3 hospitalisation, 1.3 ED and 21.0 outpatient visits per year. Length of stay was found to be significantly longer in patients with bronchiectasis compared with patients with any other respiratory illness in one study [ 91 ]. In another study, patients with bronchiectasis reported significantly more specialist appointments (radiologist appointments and chest physician appointments) compared with matched controls [ 85 ]. Patients with bronchiectasis also experienced a significant treatment burden, with up to 36.4, 58.0 and 83.0% of patients receiving long-term inhaled antibiotics, oral antibiotics and macrolides, respectively, up to 80.4% receiving long-term ICS and up to 61.7% and 81.4% receiving long-term long-acting muscarinic antagonists and long-acting beta agonists, respectively. Wide ranges of treatment use were reported in this study, which may reflect geographic variation in treatment patterns. Heterogeneous treatment patterns across Europe were observed in the EMBARC registry data with generally higher medication use in the UK and Northern/Western Europe and lower medication use in Eastern Europe (inhaled antibiotics: 1.8–8.9%; macrolides: 0.9–24.4%; ICS: 37.2–58.5%; long-acting beta agonists: 42.7–52.8%; long-acting muscarinic antagonists: 26.5–29.8%) [ 17 ]. Similarly, data from the Indian bronchiectasis registry indicate that the treatment of bronchiectasis in India is also diverse [ 19 ]. Furthermore, in a comparison of the European and Indian registry data, both long-term oral and inhaled antibiotics were more commonly used in Europe compared with India [ 19 ].

Cost varied widely across studies. However, patients, payers and healthcare systems generally accrued substantial medical costs due to hospitalisations, ED visits, outpatient visits, hospital-in-the-home and treatment-related costs. Other medical costs incurred included physiotherapy and outpatient remedies (including breathing or drainage techniques), outpatient medical aids (including nebulisers and respiration therapy equipment) and the cost of attending convalescence centres. Only one study compared the medical costs in patients with bronchiectasis and matched controls (age, sex and comorbidities) and found that patients with bronchiectasis had significantly higher total direct medical expenditure, hospitalisation costs, treatment costs for certain medications and costs associated with outpatient remedies and medical aids [ 85 ]. Bronchiectasis was also associated with indirect impacts and costs, including sick leave, sick pay and income lost due to absenteeism and missed work, and lost wages for caregivers of patients with bronchiectasis. Children with bronchiectasis also reported absenteeism from school or childcare.

Our findings regarding HRCU and costs in bronchiectasis are mirrored by a recent systematic literature review by R oberts et al . [ 117 ] estimating the annual economic burden of bronchiectasis in adults and children over the 2001–2022 time period. R oberts et al . [ 117 ] found that annual total healthcare costs per adult patient ranged from €3027 to €69 817 (costs were converted from USD to € based on the average exchange rate in 2021), predominantly driven by hospitalisation costs. Likewise, we report annual costs per patient ranging from €218 to €51 033, with annual hospital costs ranging from €1215 to €27 612 (adults and children included) ( table 4 ). Further, R oberts et al . [ 117 ] reports a mean annual hospitalisation rate ranging from 0.11 to 2.9, which is similar to our finding of 0.03–1.3 hospitalisations per year ( table 3 ). With regard to outpatient visits, R oberts et al . [ 117 ] reports a mean annual outpatient respiratory physician attendance ranging from 0.83 to 6.8 visits, whereas we report a maximum of 21 visits per year ( table 3 ). It should be noted, however, that our value is not restricted to visits to a respiratory physician. With regard to indirect annual costs per adult patient, R oberts et al . [ 117 ] reports a loss of income because of illness of €1109–€2451 (costs were converted from USD to € based on the average exchange rate in 2021), whereas we report a figure of ∼€1410 ( table 4 ). Finally, burden on children is similarly reported by us and R oberts et al . [ 117 ], with children missing 12 days of school per year per child ( table 4 ).

Limitations of this review and the existing literature

Due to the nature of this systematic literature review, no formal statistical analyses or formal risk of bias assessments were performed.

Several limitations within the existing literature were identified. Firstly, the vast majority of studies reported patients with NCFBE overall, with limited availability of literature reporting on individual aetiologies and associated disease. Furthermore, where this literature was available, it was limited to a handful of individual aetiologies and associated diseases, and in many of these studies, no statistical analyses to compare different aetiologies and associated disease were performed. Additionally, the methods used to determine aetiologies within individual studies may have differed. Literature on NCFBE and CFBE has traditionally been very distinct; as such, most of the studies included in this review have excluded people with CF. As the general term “CF lung disease” was not included in our search string in order to limit the number of hits, limited data on CFBE are included in this review. Bronchiectasis remains largely under-recognised and underdiagnosed, thus limiting the availability of literature. There is a particular knowledge gap with respect to paediatric NCFBE; however, initiatives such as the Children's Bronchiectasis Education Advocacy and Research Network (Child-BEAR-Net) ( www.improvebe.org ) are aiming to create multinational registries for paediatric bronchiectasis.

There were variations in the amount of literature available for the individual burdens. While there was more literature available on the clinical burden of bronchiectasis, economic data (related to both medical costs and indirect costs) and data on the impact of bronchiectasis on families and caregivers, were limited. Additionally, cost comparisons across studies and populations were difficult due to differences in cost definitions, currencies and healthcare systems.

Sample sizes of the studies included in this systematic literature review varied greatly, with the majority of studies reporting on a small number of participants. Furthermore, many of the studies were single-centre studies, thus limiting the ability to make generalisations about the larger bronchiectasis population, and cross-sectional, thus limiting the ability to assess the clinical and socioeconomic burden of bronchiectasis over a patient's lifetime. Furthermore, there may be potential sex/gender bias in reporting that has not been considered in this systematic literature review.

Finally, for many of the reported outcomes, data varied greatly across studies, with wide estimates for the frequency of different aetiologies and comorbidities as well as disease characteristics such as exacerbations and healthcare costs noted. This reflects the heterogeneity of both the study designs (including sample size and inclusion and exclusion criteria) and the study populations themselves. Additionally, the use of non-standardised terms across articles posed a limitation for data synthesis. Systematic collection of standardised data across multiple centres, with standardised inclusion and exclusion criteria such as that being applied in international registries, is likely to provide more accurate estimates than those derived from small single-centre studies.

• Conclusions

Collectively, the evidence identified and presented in this systematic literature review show that bronchiectasis imposes a significant clinical and socioeconomic burden on patients and their families and employers, as well as on healthcare systems. Disease-modifying therapies that reduce symptoms, improve quality of life, and reduce both HCRU and overall costs are urgently needed. Further systematic analyses of the disease burden of specific bronchiectasis aetiologies and associated disease (particularly PCD-, COPD- and post-TB-associated bronchiectasis, which appear to impose a greater burden in some aspects) and paediatric bronchiectasis (the majority of data included in this study were obtained from adults) may provide more insight into the unmet therapeutic needs for these specific patient populations.

Questions for future research

Further research into the clinical and socioeconomic burden of bronchiectasis for individual aetiologies and associated diseases is required.

• Supplementary material

Supplementary Material

Please note: supplementary material is not edited by the Editorial Office, and is uploaded as it has been supplied by the author.

Supplementary figures and tables ERR-0049-2024.SUPPLEMENT

Supplementary Excel file ERR-0049-2024.SUPPLEMENT

• Acknowledgements

Laura Cottino, PhD, of Nucleus Global, provided writing, editorial support, and formatting assistance, which was contracted and funded by Boehringer Ingelheim.

Provenance: Submitted article, peer reviewed.

Conflict of interest: The authors meet criteria for authorship as recommended by the International Committee of Medical Journal Editors (ICMJE). J.D. Chalmers has received research grants from AstraZeneca, Boehringer Ingelheim, GlaxoSmithKline, Gilead Sciences, Grifols, Novartis, Insmed and Trudell, and received consultancy or speaker fees from Antabio, AstraZeneca, Boehringer Ingelheim, Chiesi, GlaxoSmithKline, Insmed, Janssen, Novartis, Pfizer, Trudell and Zambon. M.A. Mall reports research grants paid to their institution from the German Research Foundation (DFG), German Ministry for Education and Research (BMBF), German Innovation Fund, Vertex Pharmaceuticals and Boehringer Ingelheim; consultancy fees from AbbVie, Antabio, Arrowhead, Boehringer Ingelheim, Enterprise Therapeutics, Kither Biotec, Prieris, Recode, Santhera, Splisense and Vertex Pharmaceuticals; speaker fees from Vertex Pharmaceuticals; and travel support from Boehringer Ingelheim and Vertex Pharmaceuticals. M.A. Mall also reports advisory board participation for AbbVie, Antabio, Arrowhead, Boehringer Ingelheim, Enterprise Therapeutics, Kither Biotec, Pari and Vertex Pharmaceuticals and is a fellow of ERS (unpaid). P.J. McShane is an advisory board member for Boehringer Ingelheim's Airleaf trial and Insmed's Aspen trial. P.J. McShane is also a principal investigator for clinical trials with the following pharmaceutical companies: Insmed: Aspen, 416; Boehringer Ingelheim: Airleaf; Paratek: oral omadacycline; AN2 Therapeutics: epetraborole; Renovian: ARINA-1; Redhill; Spero; and Armata. K.G. Nielsen reports advisory board membership for Boehringer Ingelheim. M. Shteinberg reports having received research grants from Novartis, Trudell Pharma and GlaxoSmithKline; travel grants from Novartis, Actelion, Boehringer Ingelheim, GlaxoSmithKline and Rafa; speaker fees from AstraZeneca, Boehringer Ingelheim, GlaxoSmithKline, Insmed, Teva, Novartis, Kamada and Sanofi; and advisory fees (including steering committee membership) from GlaxoSmithKline, Boehringer Ingelheim, Kamada, Syncrony Medical, Zambon and Vertex Pharmaceuticals. M. Shteinberg also reports data and safety monitoring board participation for Bonus Therapeutics, Israel and is an ERS Task Force member on bronchiectasis guideline development. S.D. Sullivan has participated in advisory boards for Boehringer Ingelheim and has research grants from Pfizer, Bayer and GlaxoSmithKline. S.H. Chotirmall is on advisory boards for CSL Behring, Boehringer Ingelheim and Pneumagen Ltd, served on a data and safety monitoring board for Inovio Pharmaceuticals Inc., and has received personal fees from AstraZeneca and Chiesi Farmaceutici.

Support statement: This systematic literature review was funded by Boehringer Ingelheim International GmbH. The authors did not receive payment related to the development of the manuscript. Boehringer Ingelheim was given the opportunity to review the manuscript for medical and scientific accuracy as well as intellectual property considerations. Funding information for this article has been deposited with the Crossref Funder Registry .

• Received March 8, 2024.
• Accepted June 4, 2024.
• Copyright ©The authors 2024

This version is distributed under the terms of the Creative Commons Attribution Licence 4.0.

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Literature review on collaborative project delivery for sustainable construction: bibliometric analysis.

1. Introduction

2. literature review, 2.1. collaborative project delivery, 2.2. design build (db), 2.3. construction manager at risk (cmar), 2.4. integrated project delivery method (ipd), 2.5. sustainability, 2.6. sustainable construction, 2.7. benefits of eci comparing case studies, 2.8. collaborative delivery models, 3. methodology, 3.1. research methods, 3.2. database research, 4.1. ipd, design-build, and cmar overview, 4.1.1. yearly publication distribution of db cmar and ipd, 4.1.2. major country analysis, 4.1.3. most relevant and influential journals, 4.1.4. corresponding author countries, 4.2. keyword analysis, 4.2.1. high-frequency keyword analysis, 4.2.2. co-occurrence network analysis, 4.2.3. analysis of keywords’ frequency over time, 5. discussion, 5.1. findings of advantages and disadvantages of ipd, db, and cmar for sustainable construction, 5.1.1. advantages of ipd, 5.1.2. advantages of design-build, 5.1.3. advantages of construction manager at risk, 5.1.4. disadvantages of ipd, 5.1.5. disadvantages of design-build, 5.1.6. disadvantages of construction manager at risk, 5.2. most suitable cpd technique for sustainable construction based on literature review, 5.2.1. limitations, 5.2.2. recommendations for future research, 6. future trend, 6.1. enhancing innovation through collaborative project delivery, 6.2. open communication and block chain technology, 6.3. multi-party agreement, 6.4. utilizing artificial intelligence in decision support systems, 7. conclusions, author contributions, institutional review board statement, informed consent statement, data availability statement, conflicts of interest.

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Babalola, O.G.; Alam Bhuiyan, M.M.; Hammad, A. Literature Review on Collaborative Project Delivery for Sustainable Construction: Bibliometric Analysis. Sustainability 2024 , 16 , 7707. https://doi.org/10.3390/su16177707

Babalola OG, Alam Bhuiyan MM, Hammad A. Literature Review on Collaborative Project Delivery for Sustainable Construction: Bibliometric Analysis. Sustainability . 2024; 16(17):7707. https://doi.org/10.3390/su16177707

Babalola, Olabode Gafar, Mohammad Masfiqul Alam Bhuiyan, and Ahmed Hammad. 2024. "Literature Review on Collaborative Project Delivery for Sustainable Construction: Bibliometric Analysis" Sustainability 16, no. 17: 7707. https://doi.org/10.3390/su16177707

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• Volume 58, Issue 17
• They are still children: a scoping review of conditions for positive engagement in elite youth sport
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• http://orcid.org/0000-0001-5244-6416 Stuart G. Wilson 1 ,
• http://orcid.org/0009-0000-1865-0915 Mia KurtzFavero 1 ,
• http://orcid.org/0000-0002-4616-2617 Haley H. Smith 1 ,
• http://orcid.org/0000-0003-1377-0234 Michael F Bergeron 2 ,
• http://orcid.org/0000-0002-3242-599X Jean Côté 1
• 1 School of Kinesiology & Health Studies , Queen's University , Kingston , Ontario , Canada
• 2 Performance Health , WTA Women’s Tennis Association , St. Petersburg , Florida , USA
• Correspondence to Dr Stuart G. Wilson; Stuart.wilson{at}queensu.ca

Objective The objective of this study is to characterise the key factors that influence positive engagement and desirable developmental outcomes in sport among elite youth athletes by summarising the methods, groups and pertinent topical areas examined in the extant published research.

Design Scoping review.

Data sources We searched the databases SPORTDiscus, APA PsycINFO, Web of Science and Sports Medicine & Education Index for peer-reviewed, published in English articles that considered the factors influencing positive developmental outcomes for athletes under 18 years competing at a national and/or international level.

Results The search returned 549 articles, of which 43 met the inclusion criteria. 16 studies used a qualitative approach, 14 collected quantitative data, 2 adopted mixed methods and 11 were reviews. Seven articles involved athletes competing in absolute skill contexts (ie, against the best athletes of any age) while the majority involved athletes competing in relative skill contexts (ie, against the best in a specific age or developmental group). The studies described the characteristics of the athletes, as well as their training, relationships with others, social and physical environments, and/or their overall developmental pathways.

Conclusion Existing research on positive engagement in elite youth sport aligned with and mapped onto established models of positive development in youth sport more generally. Our findings further support that, while certain youth athletes may demonstrate extraordinary performance capabilities, they are still children who benefit from positive engagement prompted and reinforced by developmentally appropriate and supportive activities, relationships and environments.

• Psychology, Sports
• Athletic Performance

Data availability statement

Data are available on reasonable request.

https://doi.org/10.1136/bjsports-2024-108200

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Contributors SGW is the guarantor. JC and MFB conceived of the project. SGW, MK, HHS and JC designed and conducted the review. SGW, MK and JC drafted the paper, and all authors contributed to editing and revising the paper.

Funding This research was supported by a Research Grant from the International Olympic Committee (IOC) and an Insight Grant from the Social Sciences and Humanities Research Council of Canada (SSHRC Grant # 435-2020-0094).

Competing interests None declared.

Provenance and peer review Not commissioned; externally peer reviewed.

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Descartes’s Method: The Formation of the Subject of Science

Tarek Dika, Descartes’s Method: The Formation of the Subject of Science , Oxford University Press, 2023, 416pp., $115.00 (hbk), ISBN 9780192869869.

Reviewed by Patrick Brissey, University of South Carolina

Descartes’s Method by Tarek Dika is perhaps the most thorough book on Descartes’s Rules for the Direction of the Mind . It is an exceptional volume written for Cartesian scholars and provides a novel and ingenious interpretation of Descartes’s infamous method, reviving it from literary slumber. Dika provides interesting responses to many of the traditional issues in the literature and is the first author to incorporate the recently published Cambridge Manuscript of the Rules to bolster his interpretation. He provides an in-depth, detailed, and well-documented account of Descartes’s faculty psychology, the non-uniform procedures of the method, the heuristics of enumeration, mathesis universalis as propaedeutic to natural philosophy, the “most noble example,” the non-hierarchical theory of simple natures, the mathematics in Rules 13–21 and how this geometrical calculus resulted in the demise of the Rules (but not the method), the proof of the anaclastic curve, and why, according to Dika, the method is efficacious.

In Part I, “The Habitual Unity of Science,” Dika contends that Descartes’s method is not a sui generis set of heuristic rules that, if followed, leads a Cartesian investigator to knowledge in natural philosophy, as is traditionally argued for (and against) in the literature. Dika’s remarkable claim is that the method is a scientific habitus (ch. 2), a cognitive disposition (virtue) of one’s ingenium to solve problems in natural philosophy, akin to the ethical habitus of Aristotle, Thomas Aquinas, John Duns Scotus, and Francisco Suarez (ch. 1). The methodical procedures, on Dika’s interpretation, are universal, applicable to any question accessible to human reason, but the method is also non-uniform; there is no fixed, mechanistic procedure for a Cartesian investigator to follow, contrary to what seems to be Descartes’s claim in Rule 5 of the Rules and in the Discourse on Method (8, 347). Dika’s seemingly ruleless method is an outstanding claim, especially considering the title of the work— Rules for the Direction of the Mind . Nevertheless, Dika’s assertion is that there are no absolute rules to the method. There are, however, contextual rules based on the parameters of the problem (93–102, 117–119, 144). Although the thesis may seem relativistic— “Do whatever whenever”—and vacuous (the method provides minimal guidance to solving problems), Dika asserts that his habitus interpretation provides “unity” to Cartesian science, for one’s ingenium coordinates the sciences to solve particular problems (73–74).

In Part II, “The Operations and Culture of the Method,” Dika provides a detailed account of Descartes’s faculty psychology and its operations (ch. 3). In line with the literature, Dika distinguishes the corporeal faculties (i.e., sensation, imagination and memory) as aids to achieving knowledge and the intellect (intuition and deduction) as vis cognoscens (the knowing power part of ingenium ). In addition, he proposes that enumeration is not only a heuristic, that is, not merely a helpful procedure conducted by his faculties, but is itself a faculty. Descartes proposes three procedures for this proposed faculty. He begins with a question, and then proceeds through enumeration by analyzing the question into sub-questions and these into more simple questions. Ultimately, the answers to the simple questions provide premises to answer the sub-questions, and, last, the initial question. Thus, the first kind of enumeration provides a framework for the method. The second kind is Descartes’s procedure for answering a question. In this case, Descartes enumerates viable explanations/solutions to a question and the cognition of the answer along with the denial of the other possibilities is cognized by enumeration (103). In contrast, other commentators contend that “intuition” cognizes the correct answer, but Dika’s claim is that the question is solved solely through “enumeration,” again, making it a faculty, a power of ingenium . The third kind of enumeration is the well-known procedure described in Rules 7 and 11 that reduces complex inferences to a near single cognition by providing repetitive reviews of the finished deduction, practically eliminating memory. What is controversial and innovative about Dika’s account is not only his claim that enumeration is a faculty, but his claim that vis cognoscens is composed of intuition and deduction as well as enumeration, and that the latter can solve problems independent of the former—a claim that seems to be in tension with Descartes’s account of the intellect, e.g., “we can have no knowledge without mental intuition or deduction” (AT 10:368, 370, 372; CSM 1:14, 15, 16).

Dika next turns to the controversial issue of the identity of mathesis universalis in Rule 4 (Jean-Paul Weber’s and John Schuster’s Rule 4B in Weber (1964) and Schuster (1980) respectively). Dika’s contention is that universal mathematics is propaedeutic to science, used to prepare the Cartesian ingenium to produce a habitus of solving scientific problems, first, in mathematics and, later, in natural philosophy (ch. 4). The Cartesian investigator, Dika tells us, is to practice “recreational mathematics” and the “so-called feminine arts” to build one’s sagacity in intuition and perspicacity in deduction and, later, will graduate to solving “the simplest and easiest mathematical sciences [. . .] the theory of proportions,” i.e., mathesis universalis (120). This practice will prepare an investigator to solve the “problem of the limits of knowledge” and then Descartes’s more advanced mathematics sketched in Rules 13–21 (perfect problems) before turning to imperfectly understood problems in natural philosophy. In contrast, John Schuster (2013) notably argues that Descartes’s mathesis universalis refers to his early mathematics linked to his programmatic phase of physico-mathematics developed with Issac Beeckman before his inflection to a general scientific method. For Schuster, Descartes created the method, in part, by generalizing aspects of mathesis universalis . In response, Dika uses Sergeantson and Edwards’s recent publication of the Cambridge Manuscript (CM) to undermine Schuster’s historically grounded argument. Sergeantson et al.’s (2023, 55–60) claim that the CM is an early manuscript of the Rules seems to be groundbreaking because this draft does not contain Descartes’s remarks about mathesis universalis , which, for Sergeantson et al ., indicates that universal mathematics is a later development and, thus, that the method could not arise from it (137–140). Schuster (2023) contends, on the other hand, that the CM is a late “curated” draft in which Descartes redacted parts (i.e., Rule 4B and the content on simple natures that were part of a largely complete version of the Rules , what Schuster calls the “Ur-source”) to make the method digestible to new consumers (e.g., Cardinal Bérulle et al . after the Chandoux lecture) before Descartes’s move to Holland.

In Part III, “The First Problem of the Method,” Dika takes up the heated issue of the “most noble example” in Rule 8, the problem of establishing the limits and scope of human knowledge. Descartes begins his solution (ch. 6) by enumerating the human cognitive faculties. He defines the corporeal faculties as dubitable, the intellect as certain, and concludes that only intuition and deduction can achieve knowledge. Dika’s contribution is the claim that this problem could not be solved by the intellectual faculties, for intuition cannot intuit that only intuition and deduction are capable of human knowledge (118, 145–146). Thus, Dika concludes that the first problem of the method is solved by enumeration.

Dika next turns to Descartes’s theory of simple natures in his problem of the limits of knowledge (ch. 7). There are three kinds of simple natures: material (e.g., extension, shape, motion), intellectual (e.g., volition, doubt, knowledge), and common (e.g., existence, unity, duration). Descartes asserts that the scope of knowledge is based on the extent of the combinations of these. Dika provides a detailed and exhaustive account of Descartes’s theory in Rule 8 and its sequel in Rule 12. His main contribution, however, is not revealed until chapter 11. Dika asserts that metaphysics cannot be foundational in the Rules , and this is because all simple natures are “equally knowable” (329). For Dika, there is no absolute ordering of simple natures in the Rules in contrast to the tree of philosophy in the Principles , no beginning with metaphysics and proceeding to physics and, then, to medicine, mechanics, and morals. In response, it seems that “equally knowable” does not “rule out” a hierarchy of the sciences. There is explicitly a hierarchy among the simple natures in any given problem, as Dika informs us, and, given his account of enumeration, a conclusion in a chain of inference is as equally known as the premises; the same would hold for a general architectonics with metaphysics at its foundation.

In Part IV, “Perfect and Imperfectly Understood Problems,” Dika provides a thorough account of Descartes’s mathematics developed in Rules 13–21 as an example of perfectly understood problems (ch. 9) and Descartes’s “proof” of the anaclastic curve as an imperfectly understood problem (ch. 10). In the latter, Dika provides a succinct summary of the popular reconstructions, all of which assert that Descartes discovered the law of refraction through, first, mathematics, after which he developed a physical description, which fits Descartes’s physico-mathematical procedure that he developed with Isaac Beeckman pre- Rules . In contrast, Dika’s reconstruction relies, in part, on Descartes’s description of the “proof” in Rule 8, where Descartes begins the constructive stage of the method with physics and then proceeds to mathematics.

Additionally, Dika explains Descartes’s mature mathematics in the later Rules , the chief example of his “perfectly understood problems.” Descartes’s aim was to unify mathematics through his theory of proportions using a calculus that only includes lines and rectangles. Dika shows that Descartes’s theory successfully explains discrete magnitudes in arithmetic, but that geometry contains both discrete and continuous magnitudes, requiring square roots in his algebraic equations, which necessitate circles (not known through intuition). This failure of his geometrical calculus resulted in the demise of the Rules (268).

In Part V, “Beyond Rules,” Dika explains (ch. 11) the fate of the method post-Rules. As we see in the Discourse and Principles, Descartes’s philosophy evolved into a hierarchical structure, and he rarely made references to the method. Did Descartes discard the method? Dika informs us that Descartes jettisoned the requirement that simple natures did not have an absolute ordering, and, further, that Descartes updated his theory of matter and intuition to accommodate his corpuscularianism (matter is indefinitely divisible) and plenum theory (matter extends indefinitely) that he developed in The World (1630–1632). However, despite these changes and others, Dika contends that the method was endorsed and used throughout Descartes’s mature philosophy.

In the Conclusion, Dika asserts that the method is efficacious and that this allows a response to post-Kuhnian historians and sociologists in the history and philosophy of science who are skeptical of method narratives (349–351). The thrust of Dika’s response is that post-Kuhnians provide “criticisms” to jettison past commentator’s sui generis (mechanical) models of the method. Dika’s proposal, however, is that Descartes’s method is not an absolute mechanical procedure, but has rules based on the parameters of the problem. Given this, Dika claims to dodge the blows of the myth of method criticisms thrown by Gaston Bachelard (1984), Alexandre Koyré (1978), Thomas Kuhn (1962), Paul Feyerabend (1993), and John Schuster 2013). In response, the issue of post-Kuhnian science is complex; covering the dynamics of science (proposals, negotiations, refinement, acceptance, and rejection of bids) in diverse, sui generis expert fields and sub-fields of research that post-Kuhnians highlight is not similar to simple, abstract method narratives. Given these dynamics, Dika’s final paragraph is insufficient to provide a refutation, much less a viable response to method skeptics (For a more thorough post-Kuhnian response, see Schuster, 2024).

In an appendix, Dika dates the earliest entries to the Rules not to 1619–20 as nearly all contemporary commentators have held post Weber’s and Schuster’s developmental thesis, but to sometime between 1626–29 (333–336). Dika provides plausible arguments. Nevertheless, his late composition thesis is in tension with Descartes’s intellectual autobiography. In the Discourse, Descartes dates his development of the method to the winter of 1619, specifically mentioning the “coronation of the emperor,” Ferdinand II, which dates to this period (AT 6:11; CSM 1:116).

Dika’s Descartes’s Method is an interesting, thought-provoking, and exceptional volume. His ingenious habitus model of Descartes’s method provides perhaps the most comprehensive explanation of the method in the literature. This publication, along with the recently published Cambridge Manuscript, will spark much needed research and debate on Descartes’s early philosophy, especially his method.

Jean-Paul Weber, La constitution du texte des “Regulae ,” Paris: Société d’édition d'enseignement supérieur, 1964, ch. 1.

John A. Shuster, “Descartes’ Mathesis Universalis , 1619–28,” in Descartes: Philosophy, Mathematics and Physics , ed. Stephen Gaukroger, Sussex: Harvester Press, 1980.

John A. Schuster, Descartes–Agonistes: Physico-Mathematics, Method and Corpuscular-Mechanism, 1618–1633 , Dordrecht: Springer, 2013, chs. 3 and 5.

René Descartes, Regulae ad directionem ingenii: an early manuscript version . Introduced, Edited, and Translated by Richard Serjeantson and Michael Edwards, Oxford: Oxford University Press, 2023, 55–60.

John A. Schuster, “The Discovery of the Century—An Early Version of Descartes’ Regulae : More Questions than Answers?” review of René Descartes: Regulae ad Directionem Ingenii, An Early Manuscript Version , Introduced, Edited and Translated by Richard Serjeantson and Michael Edwards, History of European Ideas , 2023,1–8.

Gaston Bachelard, The New Scientific Spirit , Boston: Beacon Press, 1984.

Alexandre Koyré, Galileo Studies , New Jersey: Humanities Press, 1978.

Thomas Kuhn, The Structure of Scientific Revolutions , Chicago: Chicago University Press, 1962.

Paul Feyerabend, Against Method: Outline of an Anarchistic Theory of Knowledge , New York: Verso Books, 1993.

John A. Schuster, “Heroic Resuscitation? An Attempt to Revive Descartes’ Method,” review of Descartes’s Method: The Formation of the Subject of Science , by Tarek R. Dika, Annals of Science , 2024, 1–11.