Council researchers, with funding from the Bill and Melinda Gates Foundation, are leading the implementation science component of the DREAMS initiative – assessing different aspects of the various approaches being used to reduce HIV infections among adolescent girls and young women – to determine what is working and what is not. This research will provide new evidence and guide program models that DREAMS partners need to: 1. Reach girls and young women and their sexual partners at high risk of HIV infection; 2. Link them and their partners with essential resources; 3. Develop the most effective evidence-based policies and programs to improve girls’ lives and their supportive environment. It is hoped that this evidence will be used to strengthen DREAMS and related community-based programming and policies for adolescent girls and young women.