The use of theory in the planning and implementation of health promotion programs will more reliably produce positive outcomes. Following on from the success of the first edition, Theory in a Nutshell 2nd edition explores the main theoretical concepts and models in health promotion and explains the significance, practical application and impact of different theories on the individual, community and organisation. This edition includes concise reviews of established theories, such as social cognitive theory and the health belief model, as well as expanding on new developments in the field including evidence-based policy making and health impact assessment. Thoroughly revised and updated, the book maintains the accessible style suitable for public health practitioners, health promotion and health education specialists, epidemiologists and social policy makers, as well as students of public health and health promotion.