This ground-breaking textbook is the third edition of a trusted and highly respected introduction to community psychology: its core values, its research methods and interventions, and its application to some of the most pressing issues, crises and injustices affecting today's society. The editors have focused on three contemporary social issues in order to illustrate key concepts throughout the book: climate change, affordable housing and homelessness, and immigration. Featuring a wide range of critical perspectives from international scholars and practitioners, many international examples, exercises and additional online resources, this textbook encourages students to consider theories and methodologies in light of how they might be applied to different cultures and settings.This textbook develops students' ability to think critically about the role of psychology in society, and about how the work of community psychologists can aid in the liberation of oppressed groups, promoting social justice and flourishing both for people and for our planet. It is essential reading for students taking both undergraduate and graduate courses in community psychology and related fields.