Lewin's three-stage model of change involves unfreezing the existing status quo, transitioning to a new way of operating, and then refreezing the new approach. The first stage, unfreezing, involves challenging existing beliefs and behaviors to motivate change. In the change stage, people begin adopting the new approach through communication, participation, and understanding the benefits. Finally, in the refreezing stage, the changes are institutionalized to bring stability and ensure the new approach is fully adopted.