The Lewin Change Management Model was developed by Kurt Lewin in the 1950s. It is a three-stage model that includes unfreezing, changing, and Refreezing. Unfreezing: The first stage is designed to break down resistance to change. This may involve communicating the need for change, removing obstacles, and providing support. Changing: The second stage is when the actual changes are made. This may involve training, new processes, or new policies. Refreezing: The third stage is when the changes are consolidated and made permanent. This may involve monitoring and evaluation, reinforcement, and rewards. Change management is one of the important tasks of any manager. It requires preparing, supporting, and helping individuals, teams, and organizations make organizational change. Managers can play either a proactive or reactive role in managing change.