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To the Students

Thinking is not a spectator sport.  Research shows that skills of critical thinking must be practiced with a wide variety of problems in different contexts to be learned and retained. The exercises, questions, and reviews on this site are designed to provide the systematic practice that is needed to help you become a more critical thinker. 

Be sure to discuss interesting and puzzling ideas with others in your life.  Another good way to be a good learner is to become a good teacher--both roles require a deep understanding of issues and clarity about the concepts.  Although we cannot promise that regular use of this companion website will result in "brains of steel," it can make you a better thinker.  Enjoy!

Cordially,

Diane F. Halpern 
Department of Psychology
Claremont McKenna College
Claremont, CA 91711

Heidi R. Riggio
Department of Psychology
California State University, Los Angeles
Los Angeles, CA 90032

Heather Butler
School of Organizational and Behavioral Sciences
Claremont Graduate University
Claremont, CA 91711

Acknowledgment
Some of the problems and their answers appeared in the Instructor’s Manual that accompanied the second edition of Thought and Knowledge: An Introduction to Critical Thinking.  The solutions and outlines in the Instructor’s Manual for the second edition were written by Kalin A. Anerson.  We sincerely thank her for her contributions.