The issues of capacity and capacity development in the response to HIV and AIDS is a topic of intense academic interest and is on the agenda of development practitioners, particularly as these issues are linked to community HIV and AIDS competence and sustainability of civil society organisations and community capacity. The capacity development model of the Southern African AIDS Trust is one of the more illuminating examples of capacity development of civil society organisations for the enhancement of community HIV and AIDS competence in southern Africa. The thesis examines the conceptualisation and implementation of the Southern African AIDS Trust's capacity development model in order to identify and understand the multi-dimensional factors that influence the success and sustainability of HIV and AIDS responses. It argues that, even though the conceptualisation, formulation and implementation of the model were appropriate and yielded acceptable benefits to communities in relation to HIV and AIDS, the sustainability of the model depended fundamentally on the availability of requisite resources. The dependence on external resources, the availability of which is in large part beyond the control of the Southern African AIDS Trust and its community-based beneficiaries, undercuts the sustainability of the model and the programmes delivered through it. Community capacities and community-based HIV and AIDS responses are sustainable only to the extent that communities have sufficient resources to build capacities and develop responses, or can leverage and negotiate external inputs. The degeneration of capacity in intermediary organisations (such as Southern African AIDS Trust) that support community competence undermines models that at first sight seem suitable for effective capacity enhancement with regard to HIV and AIDS programmes. In this regard, the thesis also focuses on the organisational crisis within Southern African AIDS Trust and the ramifications this had for community HIV and AIDS competence.