The timely Research Handbook examines the versatility of social norms in influencing everyday behaviours and attitudes, and highlights the importance of understanding their role in smooth societal functioning. With contributions from leading academics and practitioners, chapters analyse contemporary research and literature, emphasising how external expectations or perceptions can guide our choices. Exploring the Social Norms Approach as a practical intervention framework, the Research Handbook provides guidance on how to design and evaluate social norms-based interventions. Contributing authors utilise case studies to demonstrate the real world application of social norms-based mediations for the promotion of positive behaviour change. This Research Handbook is a helpful resource for scholars and students of psychology, sociology, social policy and behavioural economics. Researchers and practitioners across the social sciences will equally benefit from its pragmatic approach to practice and scholarship.