This document summarizes the work of IEA DSM Task 24, which focused on behavior change related to demand-side management and energy efficiency. It provides an overview of the task's objectives and subtasks, which included analyzing case studies and models of understanding behavior. It also summarizes key models used, such as rational choice models, practice theory, and theories of change for habits. Individual models focus on attitudes and intentions but may not be effective, while social models take a more systemic approach and could more easily influence global changes by changing social practices.