In public health promotion, behavioural science theories and theory-based methods should be translated into practical strategies that fit environmental conditions and are feasible for implementation. In this article, an effort to meet this challenge is presented. As a starting point we describe the conditions for development and success of the previous generation of public health promotion programmes in Finland. However, changes both in the population structure and in the population health bring new demands for programme development. We consider possibilities offered by health psychology and give a practical example of how theories and theory-based methods are applied in a community programme for type 2 diabetes prevention implemented in the Finnish primary health care.