Kurt Lewin developed a change theory consisting of three stages: unfreezing, moving to a new level, and refreezing. The unfreezing stage involves letting go of old, counterproductive patterns. The moving stage is the process of actual change in thoughts, feelings, or behaviors. The refreezing stage establishes the change as a new habit or standard procedure to prevent backsliding into old ways. Lewin also developed the concept of force field analysis to analyze driving and restraining forces that influence equilibrium and the potential for change.