Many evaluations of HIV/AIDS intervention programmes continue to focus on impact and thus overlook the processes through which any given outcomes have been achieved, this has prompted a call for a more consistent focus on what happens during interventions. Therefore, this study endeavours to provide a detailed description and critical analysis of an HIV/AIDS intervention programme. Through adopting a case-based approach, the aim is to illustrate the types of understanding that stand to be gained through the application of process evaluation.