- 2think.org - Collection of book reviews and essays, mostly on popular science, with an emphasis on science as a guide to truth. Also includes a discussion forum.
- A Field Guide to Critical Thinking (Skeptical Inquirer Winter 1990) - Six rules of evidential reasoning, a distillation and simplification of the scientific method. Ignoring the vowels, the letters in the word "FiLCHeRS" stand for the rules of Falsifiability, Logic, Comprehensiveness, Honesty, Replicability, and Sufficiency.
- An Experiment in Group Learning Technology - The results of a study designed to measure critical thinking in face-to-face and computer-supported seminars.
- Association for Informal Logic and Critical Thinking (AILACT) - A non-profit scholarly association which aims to promote research into, teaching of, and testing of informal logic and critical thinking.
- Carl Sagan's Baloney Detection Kit - Tools for testing arguments and detecting fallacious or fraudulent arguments, based on Sagan's book "The Demon Haunted World: Science as a candle in the dark."
- Critical Thinking across the Curriculum Project - Definitions, examples and argument analysis, from Longview Community College.
- Critical Thinking Study Topics - Student study guide on psychological manipulation, cult groups, sects, and new religious movements.
- Digital Bits Skeptic - Skepticism and critical thinking articles.
- Free From Faith - Comments on religion, science and scepticism.
- Mission: Critical - Tutorial for critical thinking.
- National Center for Teaching Thinking - A service organization for educators dedicated to providing programs for K - 12 schools and colleges on teaching and assessing skillful thinking,.
- Open Courseware on Critical Thinking - Over one hundred tutorials on critical thinking, logic, scientific reasoning, creativity, and other aspects of thinking skills.
- Philadelphia Association for Critical Thinking - Addressing strange phenomena with the mindset, "What are the facts and what can we deduce from them?"
- Propaganda and How to Recognize It - Essay on propaganda techniques.
- Real-World Reasoning - A course given by Peter Suber for high-school students as an introduction to college.
- Responsible Thinking - Online book by Bob Korn promoting critical thinking. Outline, contact information.
- Skeptical Analysis of the Paranormal Society (SAPS) - A group devoted to debunking, re-creating, and explaining popular claims of paranormal activity.
- Skeptoid: Critical Analysis of Pop Phenomena - Provides a weekly podcast dedicated to furthering knowledge by eliminating the widespread pseudosciences that infect popular culture.
- So You Want to Avoid Common Logical Errors? - Gives logical errors a name and points out the most common logical errors and how to avoid them.
- The Critical Thinking Community - Providing a forum and resources about Socratic questioning, higher order thinking, and critical thinking. Organizer of conferences and publisher of books and academic resources for teachers.
- Wikipedia - Critical Thinking - Hyperlinked encyclopedia entry includes an overview, concepts and principles, classroom applications, and effectiveness of instruction.
- WikiSynergy - Deal with debates and general information on all fringe or frontier subjects and skepticism.
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