This document provides an overview of change management. It discusses various models and approaches for managing change, including Lewin's three step model of unfreezing, changing, and refreezing; Bridge's three step process of ending, neutral zone, and new beginning; and Kotter's eight step plan for leading change. It also addresses principles of change, types of change, forces for change, organizational resilience, and changing organizational culture. Case studies and questions are provided at the end.