Action Research: Building Knowledge Democracies is designed to serve as a primary textbook for graduate level courses in action research. What sets it apart from other texts is its emphasis on action research as a vehicle through which schools can build knowledge democracies. This text goes beyond the "how to" of action research to examine the "why"—the historical origins, the rationale behind practice-based research, the related theoretical and philosophical perspectives, and the major paradigms of action research. A discussion of collaborative action research and action research as professional development along with a presentation of research methods and case studies demonstrates how action research can contribute to the creation of schools as centers of democratic inquiry.