The goal of this program is to explore the potential for social impact bonds, also known as pay-for-success contracts, in a developing country. This innovation, which has been piloted in the UK and the U.S., holds promise for improving the cost-effectiveness of social programs by incentivizing providers based on the social outcomes they produce and improve the public's understanding of what programs work by tying service delivery to a rigorous evaluation. The test will be conducted on a SIB established with the city of Medellin, Colombia. The SIB will establish a program to address teen pregnancy in Medellin, which will be rigorously evaluated by an external agency. The main expected outcome of this program is a pay-for-success contract signed by the government that obligates government funds for disbursement only if the social program described in this award meets predetermined outcomes.