This document summarizes Kurt Lewin's change theory, which consists of three stages: unfreezing, moving to a new level or changing, and refreezing. It explains driving and restraining forces that push for or resist change, bringing a system to equilibrium. Driving forces encourage change while restraining forces maintain the status quo. The unfreezing stage involves letting go of old patterns. The moving stage is adopting new thoughts, feelings, and behaviors. The refreezing stage establishes changes as new habits.