Breakthrough RESEARCH, with funding support from USAID/Philippines, will work with a national research institution in the Philippines to gather evidence to determine the most effective ways to encourage out-of-school adolescents ages 15 to 19 to adopt family planning. Led by the Population Council, the study will include a review of existing literature, secondary analysis, and qualitative research focusing on four priority behaviors: delay of sexual debut, use of modern contraceptive methods, use of antenatal care in the first trimester of pregnancy, and spacing births at least two years apart. The evidence generated will help determine which channels and influencers are most effective in reaching out-of-school youth and which messages would resonate best with them. The study’s results will be used to make recommendations to USAID/Philippines on future programming and policy development in family planning.