This research project seeks to address the gap in reaching adolescents with HIV testing services and linking those with HIV to treatment.Under the umbrella of the Sauti Project, the M4ID collaboration involves research among adolescent girls and boys, older male partners, health care providers and community influencers, in select regions of Sauti (Kyela District, Mbeya and Temeke District, Dar es Salaam) and will help inform HIV programming and adolescent-friendly health services across the country.