Book excerpt: Written by one of the leaders of the Physics Education Research (PER) movement, Teaching Physics is a book for anyone interested in learning how to become a more effective physics teacher. Rather than reviewing specific topics in physics with hints for how to teach them and lists of common student difficulties, Teaching Physics presents a variety of tools for improving both the teaching and learning of physics--from new kinds of homework and exam problems, to surveys for figuring out what has happened in your class, to tools for taking and analyzing data using computers and video. Teaching Physics is a companion guide to using the Physics Suite, an integrated collection of research-based instructional materials for lecture, laboratory, recitation, and workshop/studio environments. But even if you don't use a single element from the Suite, Teaching Physics can help you enhance your students' learning experience.