Teaching critical thinking:
An evidence-based guide
© 2009-2012 Gwen Dewar, Ph.D., all rights reserved
Teaching critical thinking? You might wonder if kids will work it out for themselves.
After all, lots of smart people have managed to think logically
without formal instruction in logic. Moreover, studies show that
kids become better learners when they are forced to explain how they solve problems.
So maybe kids will discover principles of logic spontaneously, as they discuss their ideas with others.
But research hints at something else, too.
Perhaps the most effective way to foster critical thinking skills is to teach those skills. Explicitly. (Abrami et al 2008).
Studies suggest that students become remarkably better problem-solvers when we teach them to
- analyze analogies
- create categories and classify items appropriately
- identify relevant information
- construct and recognize valid deductive arguments
- test hypotheses
- recognize common reasoning fallacies
- distinguish between evidence and interpretations of evidence
Do such lessons stifle creativity? Not at all. Critical thinking
is about curiosity, flexibility, and keeping an open mind (Quitadamo et
al 2008). And, as Robert DeHaan has argued, creative problem solving
depends on critical thinking skills (DeHaan 2009).
In fact, research suggests that explicit instruction in
critical thinking may make kids smarter, more independent, and more
Here are some examples--and some expert tips for teaching critical thinking to kids.
Teaching critical thinking may boost inventiveness and raise IQ
Richard Herrnstein and his colleagues gave over 400 seventh graders
explicit instruction in critical thinking--a program that covered
hypothesis testing, basic logic, and the evaluation of complex
arguments, inventiveness, decision making, and other topics.
After sixty 45-minute lessons, the kids were tested on a variety
of tasks, including tests the Otis-Lennon School Ability Test and Raven
Progressive Matrices (both used to measure IQ). The project was
Compared to students in a control group, the kids given
critical thinking lessons made substantial and statistically significant
improvements in language comprehension, inventive thinking, and even IQ
(Herrnstein et al 1986).
Teaching critical thinking in science class may help kids solve everyday problems
In another experimental study, researchers Anat Zohar and colleagues
tested 678 seventh graders’ analytical skills. Then they randomly
assigned some students to receive critical thinking lessons as part of
their biology curriculum.
Students in the experimental group were explicitly trained to
recognize logical fallacies, analyze arguments, test hypotheses, and
distinguish between evidence and the interpretation of evidence.
Students in a control group learned biology from the same textbook but got no special coaching in critical thinking.
At the end of the program, students were tested again. The
students with critical thinking training showed greater improvement in
their analytical skills, and not just for biology problems. The kids trained in critical thinking also did a better job solving everyday problems (Zohar et al 1994).
Tips for teaching critical thinking: What should parents and teachers do?
The short answer is make the principles of rational and scientific thinking explicit.
Philip Abrami and colleagues analyzed 117 studies about teaching
critical thinking. The teaching approach with the strongest empirical
support was explicit instruction--i.e., teaching kids specific ways to reason and solve problems. In studies where teachers asked students to solve problems without giving them explicit instruction, students experienced little improvement (Abrami et al 2008).
So it seems that kids benefit most when they are taught formal
principles of reasoning. And the experiments mentioned above suggest
that middle school students aren't too young to learn about logic,
rationality, and the scientific method.
If your school isn’t teaching your child these things, then it
might be a good idea to find some educational materials and work on
critical thinking skills at home.
I also wonder about the need to counteract the forces of irrationality. As I’ve complained elsewhere,
TV, books, “educational" software, and misinformed authority figures can discourage critical thinking in children.
What else can we do?
Recent research suggests that our schools can
improve critical thinking skills by teaching kids the art of debate.
And at home, parents may consider these recommendations made by Peter
Facione and a panel of experts convened by the American Philosophical
Association (Facione 1990).
The American Philosophical Association's tips for teaching critical thinking
• Start early. Young children might not be ready for lessons
in formal logic. But they can be taught to give reasons for their
conclusions. And they can be taught to evaluate the reasons given by
others. Wondering where to begin? If you have young child, check out
research-based tips for teaching critical thinking and scientific reasoning to preschoolers.
• Avoid pushing dogma. When we tell kids to do things in a certain way, we should give reasons.
• Encourage kids to ask questions. Parents and teachers
should foster curiosity in children. If a rationale doesn’t make sense
to a child, she should be encouraged to voice her objection or
• Ask kids to consider alternative explanations and solutions.
It’s nice to get the right answer. But many problems yield themselves
to more than one solution. When kids consider multiple solutions, they
may become more flexible thinkers.
• Get kids to clarify meaning. Kids should practice
putting things in their own words (while keeping the meaning intact).
And kids should be encouraged to make meaningful distinctions.
• Talk about biases. Even grade school students can understand
how emotions, motives--even our cravings--can influence our judgments.
• Don’t confine critical thinking to purely factual or academic matters. Encourage kids to reason about ethical, moral, and public policy issues.
• Get kids to write. This last recommendation doesn’t come
from Facione or the APA, but it makes good sense. As many teachers
know, the process of writing helps students clarify their explanations
and sharpen their arguments. In a recent study, researchers assigned
college biology students to one of two groups. The writing group had to
turn in written explanations of their laboratory work. The control group
had to answer brief quizzes instead. At the end of the term, the
students in the writing group had increased their analytical skills
significantly. Students in the control group had not (Quitadamo and
For more information about improving your child's problem-solving skills, be sure to check out my articles on
intelligence in children
science education for kids.
References: Tips for teaching critical thinking to kids
Abrami PC, Bernard RM, Borokhovski E, Wadem A, Surkes M A, Tamim R,
Zhang D. 2008. Instructional interventions affecting critical thinking
skills and dispositions: a stage 1 meta-analysis. Rev. Educ. Res.
DeHaan RL. 2009. Teaching creativity and inventive problem solving in science. CBE Life Sci. Educ. 8: 172-181.
Facione PA and the American Philosophical Association. 1990.
Critical Thinking: A Statement of Expert Consensus for Purposes of
Educational Assessment and Instruction. In: Research Findings and
Recommendations, Millbrae, CA: Insight Assessment.
Herrnstein RJ, Nickerson RS, Sanchez M and Swets JA. 1986. Teaching thinking skills. American Psychologist 41: 1279-1289.
Quitadamo JJ, Faiola CL, Johnson JE and Kurtz MJ. 2008.
Community-based inquiry improves critical thinking in general biology.
CBE Life Sci. Educ. 7: 327-337.
Quitadamo IJ and Kurtz MJ. 2007. Learning to Improve: Using
Writing to Increase Critical Thinking Performance in General Education
Biology CBE Life Sci Educ 6(2): 140-154.
Zohar A, Weinberger Y and Tamir P. 1994. The effect of the
biology critical thinking project on the development of critical
thinking. Journal of Res. Sci. Teachiing 31(2): 183-196.
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