This book examines the theoretical developments in the field of Action Research from a historical perspective. The central focus of the investigation is the concepts of democracy and subjectivity as defined by the field's various traditions. To address this issue, this book offers a thorough investigation of the theoretical and historical underpinnings of Action Research in order to argue that such a clarification allows for a transcendence of the distinction between theory and practice in political action. This transcendence will be achieved with the theories of the German critical psychologist Klaus Holzkamp and his interpretation of subjectivity and democracy. Holzkamp establishes a comprehensive mode of change based on the contradiction of existing possibilities for action and restrictions in a concretely given empirical situation. This book is aimed at History of Psychology Classes, Social Workers, Activism Researchers, Undergraduate Courses in Critical Thinking and Political Action, and Decolonial Theory in Psychology.