CBPR has become an essential public health competency, according to the Institute of Medicine. This second edition of the best-selling book on the topic presents a complete and practical overview of the theory and application of community based participatory research in public health. The book includes information on planning and conducting research, working with communities, promoting social change, and core research methods. New in this edition are chapters on predicting outcomes, ethical practices, use of the web, impact of CBPR on research methods, and applications for environmental justice and power mapping.