Peer Instruction:  A User’s Manual is a step-by-step guide for instructors on how to plan and implement Peer Instruction lectures. The teaching methodology is applicable to a variety of introductory science courses (including biology and chemistry). However, the additional material—class-tested, ready-to-use resources, in print and on disk (so professors can reproduce them as handouts or transparencies)—is intended for calculus-based physics courses.