The UK will generate new evidence on ‘what works’ to transform the lives of poor adolescent girls to enable them to move out of poverty. Results will directly inform DFID and other international and national actors to develop or revise policies and programmes to effectively reach adolescent girls. It will enable girls to have increased voice, choice, and control over their lives in at least 4 DFID priority countries and lead to reduction in early and forced marriage, reduction in violence, and improved economic wellbeing. Evidence will lead to an increase in donor and national investments for girls.