This text presents an overview of current approaches dedicated to understanding how design may be used intentionally to make changes to improve a range of problematic social and environmental issues. It offers a cross-disciplinary and cross-sectoral overview of different academic theories adopted and applied to design for behaviour change. The aim of the volume is twofold: firstly, to provide an overview of existing design models that integrate theories of change from differing scientific backgrounds; secondly, to offer an overview of application of key design for behaviour change approaches as used across case studies in different sectors, such as design for health and wellbeing, sustainability, safety, design against crime and social design. will appeal to designers, design students and practitioners of behavioural change.