critical thinking is purposeful judgment which results in

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• Introduction

Overview of Critical Thinking Skills

• Teaching Observations
• Avenues for Research
• CTS Tools for Faculty and Student Assessment
• Critical Thinking and Assessment
• Conclusions
• Bibliography
• Helpful Links
• Appendix A. Author's Impressions of Vignettes

What is Critical Thinking?

Many researchers, including Facione, Simpson and Courtneay, Banning, Brookfield, Ornstein and Hunkins, Sternberg, Ennis, and Lipman, have defined critical thinking (CT). Researchers debate whether critical thinking can be learned or if it's a developmental process regulated by motivations, dispositions, and personality traits. Despite differences of opinion, many researchers agree that critical thinking is "Purposeful, self-regulatory judgment which results in interpretation, analysis, evaluation, and inference, as well as explanation of the evidential, conceptual, methodological, criteriological or contextual considerations upon which judgment is based. 11

Critical thinking is also regarded as intellectually engaged, skillful, and responsible thinking that facilitates good judgment because it requires the application of assumptions, knowledge, competence, and the ability to challenge one's own thinking. Critical thinking requires the use of self-correction and monitoring to judge the rationality of thinking as well as reflexivity. When using critical thinking, individuals step back and reflect on the quality of that thinking. Simpson and Courtneay point out that critical thinking processes require active argumentation, initiative, reasoning, envisioning and analyzing complex alternatives, and making contingency-related value judgment. 12

According to Banning, critical thinking involves scrutinizing, differentiating, and appraising information as well as reflecting on information to make judgments that will inform clinical decisions. 13  Brookfield asserts that identifying and challenging assumptions and analyzing assumptions for validity are essential to critical thinking skills. He also suggested that because critical thinkers possess curiosity and skepticism, they are more likely to be motivated to provide solutions that resolve contradictions. 14

Others such as Ornstein and Hunkins suggest that critical thinking and thinking skills refer to problem-solving and other related behaviors. 15  For a number of years, dental educators thought teaching problem-solving skills was akin to teaching critical thinking skills. While teaching problem-solving skills is important to the process of learning how to use critical thinking skills, in the absence of other learning activities it may not be enough.

Sternberg, Ennis, and Lipman assert that critical thinking skills are not a fixed entity but a form of intelligence that can be taught. 16-19  The ability to develop critical thinking skills may be likened to Piaget's concrete and formal operations. If students have not yet reached the formal operations stage, their ability to use critical thinking skills may be limited by an inability to handle abstract ideas. It is important to remember that Piaget's stages of cognitive development are also linked to intellectual potential and environmental experiences. If the learning environment is crucial to the development of critical thinking skills, what instructional strategies can be used to promote critical thinking?

Sternberg asserts that critical thinking involves complex mental operations that cannot be broken into discrete styles of thinking. He claims that CT involves students' total intellectual functioning, not a narrowly defined set of skills. He postulates that there are three mental processes fostering critical thinking: meta-components, performance components, and knowledge-acquisition strategies. 20  Meta-components refer to higher-order mental processes that individuals use to plan, monitor, and evaluate what they do. Performance components refer to the actual steps taken or strategies used, while knowledge-acquisition strategies refer to the ways in which individuals relate old to new material and apply new material. Sternberg does not specify a "how" approach to teaching and learning critical thinking skills. Instead, he provides general guidelines for developing or selecting a program or curriculum that will foster CTS. Interestingly, although not surprisingly, Sternberg states that students are not adequately prepared for the problems and critical thinking tasks they will face in everyday life because they are not taught these skills in their formative years. 21  Tasks that stress right answers or truth telling or use objectively scored tests are generally removed from real-world relevance. Thus, it is particularly important that all aspects of dental educational curriculum stress real-world practice, the importance of oral health care, and the relationship of overall oral health care to systemic health by teaching students how to use critical thinking skills.

Lipman, like Sternberg, does not specify a "how to" approach. However, he makes clear distinctions between ordinary thinking and critical thinking. He explains that ordinary thinking is simplistic thinking because it does not rely upon the use of standards or criteria. Examples of ordinary thinking are guessing, believing, and supposing. Lipman describes critical thinking as a complex process based on standards of objectivity, utility, or consistency in which students can reflect upon the certainty of their thinking because critical thinking is self-correcting. 22  In order words, students can defend their thinking with evidence. Ennis asserts that to help students develop critical thinking skills, teachers must understand the cognitive processes that constitute critical thinking and use instructional activities that will develop these processes. He recommends instructors teach students how to define and clarify information, ask appropriate questions to clarify or challenge statements or beliefs, judge the credibility of sources, and solve problems by predicting probable outcomes through logic or deduction. Ennis also suggests that critical thinkers demonstrate particular attributes. Critical thinkers tend to:

Critical thinkers use these skills appropriately and usually without prompting. They are generally predisposed to think critically and to evaluate the outcome of their thought processes. 24

Instructional Strategies and Critical Thinking

Researchers have asserted that how educators teach has a direct influence on what is learned. 25  Thus, the instructional strategies selected must be appropriate to the desired outcomes. For example, strategies of inquiry are contingent upon the problem being investigated and the targeted concepts, so it is essential that they be integrated with the associated processes of inquiry in order for students to see how new knowledge evolves. 26  Researchers have also recommended eliminating superfluous activities and repetitious content and expanding learner-centered active forms of experiences to promote critical thinking skills. 27  If the goal is for students to use critical thinking skills, then the following opportunities should constitute the majority of learning activities:

     a) Engaging in problem-based learning      b) Analyzing case-based scenarios      c) Engaging in debates, role-play, argument mapping, thinking aloud, and simulation among others 28  

The benefit of engaging students in learning experiences that utilize critical thinking skills is the public nature of their thinking. When students engage in CTS, they have an opportunity to examine tacitly held knowledge of one another, make knowledge and think explicitly, respond to questions and comments, and clarify their thinking processes. 29

Several researchers stated the types of instructional strategies that may be used to promote students' critical thinking skills. Weerts suggested that working in groups might reduce students' stress while trying to answer difficult questions. She points out that working together may result in better answers than working alone. 30  Many dental educators might eschew the notion of using groups. However, it is important to acknowledge that even in classes of 80 to 100 dental students, groups of six to eight students could be developed to facilitate learning and inquiry. These groups could be responsible for answering questions about readings by being called upon randomly during class time. For example, instructors can consider writing three to four focus questions that accompany the readings to guide student comprehension. Instructors could also tell students that they should to be able to answer those questions in class. In this way, students can be held responsible for learning some of this discrete information before class. Rather than having the instructor feel responsible for "telling" students what they should know, the instructor can elicit the key concepts from students. Class time can then be used to present a case where the concept is illustrated, and students can work in groups to analyze how that concept is operationalized rather than receiving discrete knowledge through a lecture. Weerts also suggests that student groups can work together and develop critical thinking skills by:

     Identifying issues      Gathering authoritative sources      Identifying potential treatments      Presenting competing points of view      Weighing modalities in light of the presenting case and then agreeing upon the treatment plan 31  

To ensure that students are developing appropriate skills, the instructor and students can use a Likert scale to rate each other on the following criteria:

     Accuracy and relevancy of supporting evidence      Credibility of authoritative knowledge      Depth and breadth of thought      Clarity and soundness of responses

Hendricson et al. suggest several active learning strategies that can be used to develop students' critical thinking skills.

Van Gelder concurs with Hendricson et al. that critical thinking must be deliberately practiced with the intent to improve performance; however, he states that CT is hard and human beings are not naturally critical. 33  Shermer agrees and describes human beings as "pattern-seeking, story-telling animals ... [who] like things to make sense, and the kinds of sense we grasp most easily are simple familiar patterns or narratives" (p. 42). 34  This penchant for the familiar affects how curriculum is designed and implemented.

As a type of thinking that eschews the uncritical acceptance of information, critical thinking should be a deliberate part of the curriculum. Moreover, exposing students to good examples is insufficient to developing critical thinking skills. Students must demonstrate the ability to transfer critical thinking skills from one situation to another. As Kuhn writes:

"The best approach . . . may be to work from both ends at once-from a bottom-up anchoring in the regular practice [of what is being taught] so that skills are exercised, strengthened and consolidated as well as from a top-down fostering of understanding and intellectual values that play a major role in whether these skills will be used." (p. 24). 35

Kuhn's point has implications for teaching critical thinking skills in the basic science courses as well. Even though students are heavily immersed in learning a tremendous amount of information, they should still be presented with critical thinking learning experiences that embed concepts in actual practice-based scenarios. 36

Argument mapping

Van Gelder suggests that students' critical thinking skills improve faster when instruction is based upon argument mapping. He asserts that when arguments are presented in diagrammatic form, students are more capable of following critical thinking procedures. Because argument maps are visual and more transparent, they make the core operations of critical thinking more straightforward. Van Gelder cautions, however, that belief preservation is a human tendency. He states that individuals tend to make evidence secondary to beliefs. Thus, critical thinking runs counter to human tendencies. Humans tend to seek evidence that supports beliefs and ignore evidence that goes against beliefs. Ideally, critical thinkers will recognize this, put extra effort into searching for evidence that contradicts their own beliefs and cultivate a willingness to change when evidence to the contrary begins to mount. 37

To apply argument mapping to clinical reasoning, consider Case #1.

Case #1-Differing Views on Patient Treatment

A 60-year-old woman has internal resorption of the left maxillary lateral incisor. Radiographic exams reveal that saving the tooth is questionable. The student dentist recommends to Professor Marlin that the patient receive a fixed partial denture (FPD). Marlin confers with Professor James, and James recommends a removable partial denture (RPD).

• The students are instructed to use argument mapping to explain the phenomenon.
• Next, students are asked to write about the contradictions that differentiate viewpoints about FPD and RPD and to write about the counterarguments.
• 3. Finally, students are to identify their treatment decisions and provide evidence that supports or justifies their assertions.

Think-aloud seminar

Lee and Ryan-Wenger recommend the use of the "think-aloud seminar" as a teaching tool. Students are presented with a case and asked relevant questions regarding symptoms and presenting signs. Using this approach, students can exclude underlying pathologies based upon the presentation. This process of excluding potential diagnoses aids students' critical thinking by encouraging them to openly verbalize the rationales behind their opinions. 38

Wong and Chung used simulation to develop diagnostic reasoning skills among nursing students. Students were asked to consider the etiological factors, presenting symptoms, and clinical signs of a patient who presented with a particular condition. As they examined the underlying patholophysiology, the CTS they developed were "assessing duration" and "frequency of symptoms and additional triggers." They also were expected to review their understanding of the possible pathophysiological significance. The next set of CTS they focused on was "considering the pros and cons of treatments" and "drug actions and the possible side effects on the patient." Finally they explored the efficacy of the outcomes. CTS developed in this phase were "determining the success of the treatment," "determining complications," "considering the time it took to resolve the clinical signs and symptoms," and "considering reasons for the development of symptoms." 39

Other strategies

Other strategies that can promote critical thinking include particular behaviors, especially asking questions.

Table 3. Strategies that Promote Critical Thinking

Asking particular types of questions also promotes critical thinking.

  Table 4. Questions that Promote Critical Thinking

Also, Facione and Facione (1996) recommend that students begin analyzing their own thinking. For example, "If you were teaching a colleague about this situation, how would you lead him or her through the issues?" 41

Logical Fallacies

While faculty strive to develop students' abilities to use critical thinking, it is also important to communicate the logical fallacies students may demonstrate in their writing or speaking. Engel provides an overview that illustrates the common fallacies. 42 Three common types of fallacies are shown in Table 5.

Table 5. Common Logical Fallacies (Adapted from Engel, 1990)

Allowing Time for Reflection

Teaching students how to use critical thinking skills shifts teaching from a model that largely ignores thinking to an approach that renders it pervasive 43 When content is didactically taught, it is treated as static and students are unlikely to question or think it through. They tend to rely on rote memorization without grasping the logic, supporting evidence and application of what they are trying to memorize. Students who learn through a critical thinking process truly learn content. At every level, students need to learn how to:

Ask questions precisely, define contexts and purposes, pursue relevant information, analyze key concepts, derive sound inferences, generate good reasons, recognize questionable assumptions, trace important implications, and think empathetically within different points of view (p. 20). 44

Critical thinking is difficult and requires overt practice using a variety of learning activities across the dental curriculum. It is also important to recognize the role that reflection plays in its development. Students need time to think about what they are learning and reflect upon that information. However, what they are learning must have an impact on their feelings in order for critical thinking to occur.

Emotions and Critical Thinking 

The role of emotion in learning to use critical thinking skills is yet another area that necessitates research inquiry. As Zull suggests, if we want students to retain concepts we must allow them to put things into their own words, verbally and in writing. 45  Give students time to think before speaking and better construct ideas in their own words. Processing information takes time; stating one's thinking correctly also takes time. If a student cannot do this alone, we can give him or her the opportunity to discuss questions with others. Giving students time to reflect is giving them time to make connections.

Zull explains the process that takes place within the brain. First, the sensory cortex receives sensory input or concrete experiences. Next, the back integrative cortex tries to create meaning and images during the human process of reflection. The frontal integrative cortex is responsible for short-term memory and problem solving, making decisions and language, and making judgments and evaluations. This activity is akin to how learners handle abstractions-manipulating images and language to create new mental arrangements. The motor cortex triggers all coordinated and voluntary muscle contractions. This matches with the action that completes the learning cycle-actively testing abstractions and converting ideas into physical actions. The brain visualizes items in small amounts and all information arrives at the same time, producing an outline of objects and features in the visual field. 46 Thus, the brain can fully see great detail and nuance. Converting ideas into images helps students learn. Images enhance recall and aid in discovery. Sometimes the best teaching is just showing the student how.

To ensure that students learn, educators need to limit the amount of information they give. Instructors should limit or condense to three or four pieces the amount of information they want students to process.

The amygdala is responsible for screening experiences. 47  If something is recognized as dangerous, the amygdale will instinctively cause the body to "freeze." When a student first encounters something new, he or she may have a somewhat negative reaction. The instructor needs to find a way for the student to move into a more positive emotional territory. 48  Making suggestions or showing examples can remind the student what he or she already knows, and then the student can hang newly acquired knowledge on that "scaffolding." The support given by the instructor allows the student some level of success. Recognizing his or her success helps the student feel more hope, interest, and curiosity. At this point, the student is able to assume more control of the learning process. Boyd (2002) concurs and states, "emotions ... constantly regulate what we experience as reality." She also points out, "The limbic system plays an important role in processing emotion and memory and therefore appears to be important in the transfer of short-term memory into long-term memory." 49  Engaging students emotionally and actively strengthens memory.

Teaching students to use CTS during instruction

There is some empirical evidence that a four-year undergraduate experience contributes to modest gains in overall CT. However, there is little scientific evidence that a single course, other than a critical thinking skills course makes a positive measurable difference. 50  Even in the case of a specific CTS course, the evidence is mixed. 51

Recent studies show that limited efforts to infuse critical thinking in instruction can lead to improved scores on the Cornell Critical Thinking Test Level Z, a test that is aimed at a sophisticated audience and measures six common critical thinking skills. 52  Allegrettti and Frederick (1995) reported pre- to post-test gains on the Cornell Z for a group of college seniors (n = 24) who took a capstone integrated psychology and philosophy course. 53  Solon (2001) found that a partial treatment group of psychology students (n = 26) improved their scores on the Cornell Z compared to a group of untreated humanities students (n = 26). The results were statistically significant (beyond .001). In 2003, Solon studied three groups to compare coursework effects and reported that the full treatment group (n = 25) significantly outscored both the partial (n = 25) and non-treatment (n = 25) groups on the Cornell Z test. 54  Solon (2007) reported that a group of introductory psychology students (n = 25) received a moderate infusion of critical thinking skills (10 hours instruction and 20 hours homework). Compared to the non-treatment group (n= 26), the experimental group significantly improved their scores on the Cornell Z test. 55  These findings suggest that even a moderate infusion of critical thinking skills instruction can result in enhanced reasoning skills without requiring a significant investment from the instructor. 56

Collins and Onwuegbuzie reported significant relationships between overall CTS and achievement in a graduate level research methodology course at the midterm (r = .34, p < .01) and final (r = .26, p < .01) stages. 57  Onwuegbuzie compared the CTS of master's and doctoral level students. He reported that doctoral level students (n = 19) obtained statistically higher overall CTS using the California Critical Thinking Skills Test than the masters' degree students (n = 101, t = -3.54, p < .01). The effect size (d = 0.92) associated with this difference was extremely large. 58

Teaching CTS requires instruction that uses higher order taxonomic skills. These skills require student demonstration or teacher usage of behaviors classified as analysis, evaluation, and creation (levels 4, 5, and 6 on Bloom's revised taxonomy). When teaching takes place at higher levels of learning, lower order behaviors such as remembering, understanding, and applying are subsumed within instruction. The following table lists behaviors common at each level of learning and examples of related dental education activities.

Table 6. Revised Bloom's Taxonomy, Sample Verbs, and Related Learning Activities 59

Making Critical Thinking Explicit

Teaching for critical thinking is a rational and intentional act. Typically, instructors cannot suddenly decide to teach CTS and develop an appropriate learning activity. An instructor must have a clear understanding of what CTS is, how it is implemented during instruction, and what strategies should be used during particular classroom and predoctoral clinical learning activities. Developing a repertoire of well-honed CTS activities appropriate to your specific discipline is advisable.

Also crucial to the teaching of CTS is an educator announcing to students he or she will teach CTS, how he or she intends to do so, and what will be required of the students as learners. It is important to have an explicit conversation with students about what CTS is, what it looks like, and how educators will model it so students can differentiate the teaching of CTS from lower level learning. Effective teaching of university-age students is characterized by collegial and collaborative processes, not instruction that is ambiguous. In ambiguous instruction, the learner does not know what to expect next or have a clear understanding of what behavioral or skill changes he or she should demonstrate as a result of teacher-student interaction. Teaching explicitly helps ensure that less re-teaching will be necessary. Both teachers and students know their responsibilities as instructors and learners.

Stages of Critical Thinking

Paul and Elder claim that individuals progress through predictable stages of unreflective, challenged, beginning, practicing, advanced, and master thinking. 60  They state that unless educators help students develop an intellectual vocabulary for discussing their thought processes and challenge them to identify the problems in their thinking, the students' cognitive processes will remain invisible to them. The implication for curriculum development: If instructors want students to develop critical thinking skills, then critical thinking must be integrated into the foundations of instruction.

It is also important to recognize that when patient care is task focused, it can obscure the bigger picture and become a barrier to the development of critical thinking skills. Individual personality, background, and position might also limit one's ability to think critically. Additionally, gender, age, religion, and socioeconomic status might influence the development of critical thinking skills. One of the biggest barriers to the development of CTS is our educational system. Although it is important to recognize these attributes as potential barriers, it is more important that dental educators establish the kind of learning environments that will foster the development of CTS.

Case #2-Why Are Mrs. Connor's Teeth Yellow?

Mrs. Connor, a 74-year-old white female, comes to your office as a new patient. She presents you with a complaint that her teeth have become yellowed and unattractive. Her husband died one year prior, and since then she has been drinking 8-10 cups of coffee daily. Her internist diagnosed anemia and high blood cholesterol. She is taking iron and Lipitor. She feels better since she began taking Lipitor, but feels her teeth are too yellow. She recently met a widower who invited her to dinner next week. She is worried about the appearance of her teeth.

• Working in groups of six, students are asked to write at least four hypotheses about why Mrs. Connor's teeth are yellow.
• Students must also determine if whiter teeth are important to the health and well being of geriatric patients.
• Students must discuss if there a relationship between the need of care and the use of dental services by older patients.
• A student group will then outline its recommendations and a rationale for the treatment plan to be presented to Mrs. Connor at her next dental appointment.

Teachers must recognize that not all students will apply critical thinking skills at the same rate they learn these skills. Thus, instructional methods and objectives need to match students' cognitive and experiential abilities while trying to stretch students to their growing edge. 61  Students' capacity for self-directed learning (SDL), which is required to implement reflective judgment, underlies many of the critical thinking skill dispositions. 62  There is evidence that the students who routinely use the "learn by doing" approach to explore problems develop more sophisticated SDL than students in lecture-based curricula. 63  The reflection element of critical thinking is considered essential to clinical judgment. 64  Tanner asserts that using the skills associated with reflective thinking prepares students for ill-structured or ambiguous problems that they are likely to encounter in clinical practice. 65

Problem-based learning (PBL) is a popular instructional strategy for promoting collaboration and reflection and negotiating different and individual constructions of knowledge. Some researchers assert that PBL is best used when problems are unsolvable or when they generate many individual constructions of knowledge that appear valid. 66  However, using only problem-based learning to teach critical thinking skills may not be enough. This instructional strategy does not necessarily equip students with the ability to analyze or critique a given situation or the information with which they are been provided. A variety of instructional strategies that give students the opportunity to think aloud, role play, prioritize alternatives, communicate conclusions effectively, simulate, or defend the logical basis of their thinking is recommended to foster students' ability to use critical thinking.

Asking students to apply their understanding of dental and medical knowledge to treatment planning and diagnosis is not an example of CTS. However, asking students to determine differential diagnoses of caries and periodontal disease among patients at various stages of lung cancer requires the ability to reason and justify particular treatment plans or demonstrate critical thinking skills. Habits of the students who demonstrate critical thinking are:

Case #3-Female with Erythroplakia

Mrs. Jacklin, a 40-year-old female, presents you with a history of SLE and erythroplakia on the left lateral border of the tongue. She states she is experiencing a burning sensation on her tongue. She asks why she is having this discomfort and what she can do to make the sore on her tongue go away. The oral exam shows that Mrs. Jacklin has poor oral hygiene and mild dry mouth (xerostomia) but is otherwise not in danger for oral health concerns.

• Working in groups of four, students are asked to locate the four most recent references on oral lesions.
• Using those resources, they are asked to write five or six reasons that the patient is experiencing a tongue lesion and determine what questions they should ask the patient about her personal and social history.
• Next, they identify questions to ask her about her medical history.
• Using the information they have acquired, they are asked to generate a list of potential treatment plans and the benefits and limitations of each plan.
• What should they tell the patient and why?

Critical thinking is not :

Critical thinking cannot be taught in a learning environment where the dental educator always lectures, tells students what ought to be undertaken during patient treatment, or shows students how to do a procedure correctly. Some habits of students who do not use critical thinking skills are:

Critical thinking skills can be developed with frequent practice and the use of ill-structured problems and situations that require the ability to recall useful knowledge quickly, use pattern recognition, discern pertinent information, think ahead, and anticipate outcomes and problems while remaining composed so that emotions do not hinder decisionmaking skills. However, it is important to recognize CTS do not develop spontaneously or with maturation. Since strong personality components underlie CT dispositions, what happens if students admitted to colleges of dentistry do not already possess these traits?

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1 Introduction to Critical Thinking

I. what is c ritical t hinking [1].

Critical thinking is the ability to think clearly and rationally about what to do or what to believe.  It includes the ability to engage in reflective and independent thinking. Someone with critical thinking skills is able to do the following:

• Understand the logical connections between ideas.
• Identify, construct, and evaluate arguments.
• Detect inconsistencies and common mistakes in reasoning.
• Solve problems systematically.
• Identify the relevance and importance of ideas.
• Reflect on the justification of one’s own beliefs and values.

Critical thinking is not simply a matter of accumulating information. A person with a good memory and who knows a lot of facts is not necessarily good at critical thinking. Critical thinkers are able to deduce consequences from what they know, make use of information to solve problems, and to seek relevant sources of information to inform themselves.

Critical thinking should not be confused with being argumentative or being critical of other people. Although critical thinking skills can be used in exposing fallacies and bad reasoning, critical thinking can also play an important role in cooperative reasoning and constructive tasks. Critical thinking can help us acquire knowledge, improve our theories, and strengthen arguments. We can also use critical thinking to enhance work processes and improve social institutions.

Some people believe that critical thinking hinders creativity because critical thinking requires following the rules of logic and rationality, whereas creativity might require breaking those rules. This is a misconception. Critical thinking is quite compatible with thinking “out-of-the-box,” challenging consensus views, and pursuing less popular approaches. If anything, critical thinking is an essential part of creativity because we need critical thinking to evaluate and improve our creative ideas.

II. The I mportance of C ritical T hinking

Critical thinking is a domain-general thinking skill. The ability to think clearly and rationally is important whatever we choose to do. If you work in education, research, finance, management or the legal profession, then critical thinking is obviously important. But critical thinking skills are not restricted to a particular subject area. Being able to think well and solve problems systematically is an asset for any career.

Critical thinking is very important in the new knowledge economy.  The global knowledge economy is driven by information and technology. One has to be able to deal with changes quickly and effectively. The new economy places increasing demands on flexible intellectual skills, and the ability to analyze information and integrate diverse sources of knowledge in solving problems. Good critical thinking promotes such thinking skills, and is very important in the fast-changing workplace.

Critical thinking enhances language and presentation skills. Thinking clearly and systematically can improve the way we express our ideas. In learning how to analyze the logical structure of texts, critical thinking also improves comprehension abilities.

Critical thinking promotes creativity. To come up with a creative solution to a problem involves not just having new ideas. It must also be the case that the new ideas being generated are useful and relevant to the task at hand. Critical thinking plays a crucial role in evaluating new ideas, selecting the best ones and modifying them if necessary.

Critical thinking is crucial for self-reflection. In order to live a meaningful life and to structure our lives accordingly, we need to justify and reflect on our values and decisions. Critical thinking provides the tools for this process of self-evaluation.

Good critical thinking is the foundation of science and democracy. Science requires the critical use of reason in experimentation and theory confirmation. The proper functioning of a liberal democracy requires citizens who can think critically about social issues to inform their judgments about proper governance and to overcome biases and prejudice.

Critical thinking is a   metacognitive skill . What this means is that it is a higher-level cognitive skill that involves thinking about thinking. We have to be aware of the good principles of reasoning, and be reflective about our own reasoning. In addition, we often need to make a conscious effort to improve ourselves, avoid biases, and maintain objectivity. This is notoriously hard to do. We are all able to think but to think well often requires a long period of training. The mastery of critical thinking is similar to the mastery of many other skills. There are three important components: theory, practice, and attitude.

III. Improv ing O ur T hinking S kills

If we want to think correctly, we need to follow the correct rules of reasoning. Knowledge of theory includes knowledge of these rules. These are the basic principles of critical thinking, such as the laws of logic, and the methods of scientific reasoning, etc.

Also, it would be useful to know something about what not to do if we want to reason correctly. This means we should have some basic knowledge of the mistakes that people make. First, this requires some knowledge of typical fallacies. Second, psychologists have discovered persistent biases and limitations in human reasoning. An awareness of these empirical findings will alert us to potential problems.

However, merely knowing the principles that distinguish good and bad reasoning is not enough. We might study in the classroom about how to swim, and learn about the basic theory, such as the fact that one should not breathe underwater. But unless we can apply such theoretical knowledge through constant practice, we might not actually be able to swim.

Similarly, to be good at critical thinking skills it is necessary to internalize the theoretical principles so that we can actually apply them in daily life. There are at least two ways to do this. One is to perform lots of quality exercises. These exercises don’t just include practicing in the classroom or receiving tutorials; they also include engaging in discussions and debates with other people in our daily lives, where the principles of critical thinking can be applied. The second method is to think more deeply about the principles that we have acquired. In the human mind, memory and understanding are acquired through making connections between ideas.

Good critical thinking skills require more than just knowledge and practice. Persistent practice can bring about improvements only if one has the right kind of motivation and attitude. The following attitudes are not uncommon, but they are obstacles to critical thinking:

• I prefer being given the correct answers rather than figuring them out myself.
• I don’t like to think a lot about my decisions as I rely only on gut feelings.
• I don’t usually review the mistakes I have made.
• I don’t like to be criticized.

To improve our thinking we have to recognize the importance of reflecting on the reasons for belief and action. We should also be willing to engage in debate, break old habits, and deal with linguistic complexities and abstract concepts.

The  California Critical Thinking Disposition Inventory  is a psychological test that is used to measure whether people are disposed to think critically. It measures the seven different thinking habits listed below, and it is useful to ask ourselves to what extent they describe the way we think:

• Truth-Seeking—Do you try to understand how things really are? Are you interested in finding out the truth?
• Open-Mindedness—How receptive are you to new ideas, even when you do not intuitively agree with them? Do you give new concepts a fair hearing?
• Analyticity—Do you try to understand the reasons behind things? Do you act impulsively or do you evaluate the pros and cons of your decisions?
• Systematicity—Are you systematic in your thinking? Do you break down a complex problem into parts?
• Confidence in Reasoning—Do you always defer to other people? How confident are you in your own judgment? Do you have reasons for your confidence? Do you have a way to evaluate your own thinking?
• Inquisitiveness—Are you curious about unfamiliar topics and resolving complicated problems? Will you chase down an answer until you find it?
• Maturity of Judgment—Do you jump to conclusions? Do you try to see things from different perspectives? Do you take other people’s experiences into account?

Finally, as mentioned earlier, psychologists have discovered over the years that human reasoning can be easily affected by a variety of cognitive biases. For example, people tend to be over-confident of their abilities and focus too much on evidence that supports their pre-existing opinions. We should be alert to these biases in our attitudes towards our own thinking.

IV. Defining Critical Thinking

There are many different definitions of critical thinking. Here we list some of the well-known ones. You might notice that they all emphasize the importance of clarity and rationality. Here we will look at some well-known definitions in chronological order.

1) Many people trace the importance of critical thinking in education to the early twentieth-century American philosopher John Dewey. But Dewey did not make very extensive use of the term “critical thinking.” Instead, in his book  How We Think (1910), he argued for the importance of what he called “reflective thinking”:

…[when] the ground or basis for a belief is deliberately sought and its adequacy to support the belief examined. This process is called reflective thought; it alone is truly educative in value…

Active, persistent and careful consideration of any belief or supposed form of knowledge in light of the grounds that support it, and the further conclusions to which it tends, constitutes reflective thought.

There is however one passage from How We Think where Dewey explicitly uses the term “critical thinking”:

The essence of critical thinking is suspended judgment; and the essence of this suspense is inquiry to determine the nature of the problem before proceeding to attempts at its solution. This, more than any other thing, transforms mere inference into tested inference, suggested conclusions into proof.

2) The  Watson-Glaser Critical Thinking Appraisal  (1980) is a well-known psychological test of critical thinking ability. The authors of this test define critical thinking as:

…a composite of attitudes, knowledge and skills. This composite includes: (1) attitudes of inquiry that involve an ability to recognize the existence of problems and an acceptance of the general need for evidence in support of what is asserted to be true; (2) knowledge of the nature of valid inferences, abstractions, and generalizations in which the weight or accuracy of different kinds of evidence are logically determined; and (3) skills in employing and applying the above attitudes and knowledge.

3) A very well-known and influential definition of critical thinking comes from philosopher and professor Robert Ennis in his work “A Taxonomy of Critical Thinking Dispositions and Abilities” (1987):

Critical thinking is reasonable reflective thinking that is focused on deciding what to believe or do.

4) The following definition comes from a statement written in 1987 by the philosophers Michael Scriven and Richard Paul for the  National Council for Excellence in Critical Thinking (link), an organization promoting critical thinking in the US:

Critical thinking is the intellectually disciplined process of actively and skillfully conceptualizing, applying, analyzing, synthesizing, and/or evaluating information gathered from, or generated by, observation, experience, reflection, reasoning, or communication, as a guide to belief and action. In its exemplary form, it is based on universal intellectual values that transcend subject matter divisions: clarity, accuracy, precision, consistency, relevance, sound evidence, good reasons, depth, breadth, and fairness. It entails the examination of those structures or elements of thought implicit in all reasoning: purpose, problem, or question-at-issue, assumptions, concepts, empirical grounding; reasoning leading to conclusions, implications and consequences, objections from alternative viewpoints, and frame of reference.

The following excerpt from Peter A. Facione’s “Critical Thinking: A Statement of Expert Consensus for Purposes of Educational Assessment and Instruction” (1990) is quoted from a report written for the American Philosophical Association:

We understand critical thinking to be purposeful, self-regulatory judgment which results in interpretation, analysis, evaluation, and inference, as well as explanation of the evidential, conceptual, methodological, criteriological, or contextual considerations upon which that judgment is based. CT is essential as a tool of inquiry. As such, CT is a liberating force in education and a powerful resource in one’s personal and civic life. While not synonymous with good thinking, CT is a pervasive and self-rectifying human phenomenon. The ideal critical thinker is habitually inquisitive, well-informed, trustful of reason, open-minded, flexible, fairminded in evaluation, honest in facing personal biases, prudent in making judgments, willing to reconsider, clear about issues, orderly in complex matters, diligent in seeking relevant information, reasonable in the selection of criteria, focused in inquiry, and persistent in seeking results which are as precise as the subject and the circumstances of inquiry permit. Thus, educating good critical thinkers means working toward this ideal. It combines developing CT skills with nurturing those dispositions which consistently yield useful insights and which are the basis of a rational and democratic society.

V. Two F eatures of C ritical T hinking

A. how not what .

Critical thinking is concerned not with what you believe, but rather how or why you believe it. Most classes, such as those on biology or chemistry, teach you what to believe about a subject matter. In contrast, critical thinking is not particularly interested in what the world is, in fact, like. Rather, critical thinking will teach you how to form beliefs and how to think. It is interested in the type of reasoning you use when you form your beliefs, and concerns itself with whether you have good reasons to believe what you believe. Therefore, this class isn’t a class on the psychology of reasoning, which brings us to the second important feature of critical thinking.

B. Ought N ot Is ( or Normative N ot Descriptive )

There is a difference between normative and descriptive theories. Descriptive theories, such as those provided by physics, provide a picture of how the world factually behaves and operates. In contrast, normative theories, such as those provided by ethics or political philosophy, provide a picture of how the world should be. Rather than ask question such as why something is the way it is, normative theories ask how something should be. In this course, we will be interested in normative theories that govern our thinking and reasoning. Therefore, we will not be interested in how we actually reason, but rather focus on how we ought to reason.

In the introduction to this course we considered a selection task with cards that must be flipped in order to check the validity of a rule. We noted that many people fail to identify all the cards required to check the rule. This is how people do in fact reason (descriptive). We then noted that you must flip over two cards. This is how people ought to reason (normative).

• Section I-IV are taken from http://philosophy.hku.hk/think/ and are in use under the creative commons license. Some modifications have been made to the original content. ↵

Critical Thinking Copyright © 2019 by Brian Kim is licensed under a Creative Commons Attribution 4.0 International License , except where otherwise noted.

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Critical Thinking Criteria

There are several definitions of critical thinking. For example, Robert Ennis differentiates critical thinking from higher order thinking and Bloom’s taxonomy (Bloom et al., 1956). He defines it as “reflective and reasonable thinking that is focused on deciding what to believe or do” (Ennis, 1985, p. 45). A more recent meta-analysis defines critical thinking as “the ability to engage in purposeful, self-regulatory judgment, is widely recognized as an essential skill for the knowledge age” (Abrami et al., 2008, p. 1102). The AAC&U define it as “a habit of mind characterized by the comprehensive exploration of issues, ideas, artifacts, and events before accepting or formulating an opinion or conclusion” (Rhodes, 2010, p. 1) The author of the Delphi Report (Facione, 1990) interviewed experts in the critical thinking field and concluded that critical thinking is “purposeful, self-regulatory judgment which results in interpretation, analysis, evaluation, and inference, as well as explanation of the evidential, conceptual, methodological, criteriological, or contextual considerations upon which that judgment is based” (Facione, 1990, p. 2). Facione’s (1990) experts recommend six cognitive skills as the core of critical thinking, and each of these cognitive skills has subskills.

Adapted from Peter A. Facione, Norren Facione, and The California Academic Press, 1994.

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