This document provides an overview of the history and development of action research methodology. It discusses the key trends in action research, including traditional, contextual, radical/participatory, and educational trends. Traditional action research stems from Lewin's work in organizations and focuses on planned, top-down change. Contextual action research emphasizes relations between actors in a social environment. Radical/participatory action research aims to overcome power imbalances and bring about social justice. Educational action research focuses on curriculum development, teaching/learning practice, and professional development through community problem-solving. The document also provides definitions of action research and discusses its aims.