This document provides a comprehensive overview of Organizational Development (OD), focusing on its purpose to enhance an organization's capacity for planned change and improve overall effectiveness. It distinguishes OD from change management, outlines its historical development and key concepts, and emphasizes the significance of humanistic, optimistic, and democratic values in facilitating change. OD is also depicted as relevant for navigating uncertainties in modern organizational contexts, driven by globalization, technology, and managerial innovations.