In the context of behavior, the Transtheoretical Model is a significant framework. Developed by Prochaska and DiClemente, it outlines key stages of change. These stages include Precontemplation, where you may not yet acknowledge the need for change, and Contemplation, where the problem is recognized and change is considered. This is followed by Preparation, Action, and Maintenance. The model provides a structured approach to understanding and navigating the process of change.