This short, inexpensive guide is designed to help students learn to think critically in any subject-matter course. A combination of instruction and exercises shows them how to use critical thinking to more fully to appreciate the power of the discipline they are studying, to see its connections to other fields and to their day-to-day lives, to maintain an overview of the field so they can see the parts in terms of the whole, and to become active learners rather than passive recipients of information.