This document discusses various models and approaches for change management. It describes Lewin's model which highlights the stages of change as unfreezing, changing, and refreezing. Kotter's model focuses on establishing a sense of urgency and a guiding coalition. The ADKAR model identifies the key steps for individual change as awareness, desire, knowledge, ability and reinforcement. Guidelines are provided for facilitating change, including understanding employee psychology, defining strategies and measuring progress. Total quality management (TQM) aims to achieve continuous quality improvement through an integrated organizational effort. Business process reengineering involves fundamentally rethinking and redesigning business processes for dramatic performance improvements.