The document discusses the concept of organization development (OD), which aims to improve organizational effectiveness through planned interventions and the application of behavioral science. It outlines the historical development of OD since the 1960s, including its five contributory stems: laboratory training, action research, normative approaches, productivity and quality of work life, and strategic change. Additionally, it describes the stages of organizational development from inception to renewal and rebuilding, highlighting the evolution and transformation of organizations over time.