A variety of primary prevention strategies are used in HIV prevention programs in Africa. However, these are often developed through intuition and the theoretical basis for many interventions is limited to the knowledge/attitude model. This article illustrates how research findings from a base-line survey are combined with Paulo Freire's social change theory and the Ecological Model for Health Promotion to develop a participatory intervention for HIV/AIDS prevention in farm workers in Zimbabwe. The article addresses the need to focus attention on the process of change at the interpersonal level, organizational and policy levels of the community. Dialogue is central to the range of strategies proposed for the intervention. The effect will be measured through process and outcome evaluation.