This book provides an overview of current thinking about behaviour change, from its political and theoretical heritage to the imperatives of evidence for policymaking and various streams of emphasis for its future agenda. Given the context of non-communicable disease and environmental damage that society now faces, behaviour change is a thread running through much policymaking and academic research, and this book takes time to give key issues due consideration. The book tackles ‘behaviour change’ as a distinct cross-disciplinary field, choosing not to focus specifically on health or sustainability or transport. As such, the contributing authors have a particularly wide-ranging set of disciplinary backgrounds so that many perspectives on behaviour change are explored. Perspectives across the chapters may clash, overlap and contradict, but this merely presents a true picture of a contested field. Students, academic researchers, practitioners and policymakers alike will find it an invaluable contribution to their understanding about this demanding, engaging and politically sensitive area of modern life.