This document provides an introduction to organizational development (OD). It begins with the most comprehensive definition of OD by French and Bell, which describes it as a long-term, collaborative effort led by top management to improve an organization's vision, empowerment, learning, problem-solving and culture. It emphasizes the importance of intact work teams. The definition stresses that OD focuses on processes and culture, encourages collaboration, views organizations as complex systems, and relies on an action research model. Successful OD requires the involvement of change agents who can facilitate collaboration to define and resolve problems. The document then discusses how to assess an organization's readiness for change and outlines the typical action research process involved in OD interventions.