This document provides an overview of the IEA DSM Task XXIV, which aims to close the gap between behavior change theory and practice in demand-side management. It discusses key concepts in demand-side management and behavior change. The task involves several subtasks: an expert platform, a helicopter overview of models and case studies, development of an evaluation tool, and country-specific recommendations. It also identifies four overarching themes in behavior change related to households, small- and medium-sized enterprises, buildings, and transport.