This new and updated edition provides a complete understanding of health behavior change, from its theoretical building blocks to the practical challenges of developing and testing an intervention. It presents a theory-driven, scientific approach to understanding and changing health behaviors.

Andrew Prestwich is a Senior Lecturer in Health & Social Psychology at the University of Leeds, UK. His research examines the impact of theory-based interventions on health behavior. He has previously held posts at the University of Oxford, University of Essex and University College London.

Jared Kenworthy is Professor of Psychology at the University of Texas at Arlington, USA. His research concerns social categorization and social influence in group processes, as well as intergroup relations and prejudice reduction. He was previously a post-doctoral researcher at the University of Oxford.

Mark Conner is Professor of Applied Social Psychology at the University of Leeds. His research focuses on understanding and changing health behaviors with a focus on the role of affect, attitudes, and intentions. He has published over 300 papers and edited a number of books in this area.

1. Introduction. 2. Theory. 3. Behavior Change Techniques. 4. Theory-Based Interventions. 5. The Methodology of Health Behavior Change. 6. Analysing Health Behavior Change Data. 7. Behavior Change Through Targeting Mechanisms of Action: Health Promotion, Risk and Detection Behaviors. 8. Environment and Policy-Based Approaches to Health Behavior Change. 9. Technology-Based Approaches to Health Behavior Change. 10. Future Directions.