Community contexts and knowledge: accountability, leadership and meaningful involvement of communities in Programme Science.

The Programme Science approach provides an important opportunity to understand practical issues that will increase effective coverage in the implementation of public health and other interventions, which will require the prioritizing of key populations and their priorities in HIV and STI programmes. It will require extensive time and work to build relationships, increase capacity and share power. Where this has already happened, it has resulted in positive outcomes, including better health outcomes, reduced stigma, increased agency for key populations, and built community-led organizations and responses.