The aim of this project is to determine whether, and to what extent brief interventions in primary care and workplace settings are effective in the promotion of physical activity and nutrition, the management of weight, and changing behaviour. We propose two models of intervention in primary care and three in the workplace. The simple models for both settings involve a cardiovascular risk assessment followed by one-off lifestyle advice. The more complex models involve family/Whanau support over five sessions (primary care) and education and/or team activities to increase physical activity and healthy eating (workplace). We will compare the effects of each model on key health indicators with associated costs to understand the most appropriate approach. The delivery partners in this project - Waiora Healthcare, HealthWEST, Harbour Health, and Vitality Works - provide access to high needs, Pacific, Maori, and South Asian populations and have broad experience in primary health and workplace health delivery.