This document provides an overview of change management and the GAPSS model for managing change. It discusses change management as the process of helping individuals adapt to business and technical changes. It then introduces the GAPSS model, which describes the five phases (Grasp, Aspire, Proficiency, Skill, Supply reinforcement) that individuals go through when facing change. The document uses the GAPSS model to analyze different aspects of organizational change and provides examples of how to develop corrective actions to address gaps or resistance at each phase of change.