This textbook shows how people can and do transform the world through transforming their practices and the practice architectures that shape them, and contributes to contemporary practice theory. It provides an authoritative, comprehensive, and contemporary account of the theory of practice architectures, illustrated through examples drawn from years of research by participants in the Pedagogy, Education, and Praxis international research network from Australia, New Zealand, Finland, Norway, Sweden, the Netherlands, Colombia, and the Caribbean. Its content provides a variety of resources for researchers who are new to research using the theory of practice architectures. It includes tables to assist with the analysis of practices, and provides clear examples to aid understanding and application. This textbook provides readers with a thorough grounding in the theory and ways the theory of practice architectures has been used in investigations of social and educational practice.