Girls Shape the Future Study: Findings and Lessons Learned from an Effort to Assess the Effectiveness of the Girls Incorporated Will Power/Won't Power Program

This report presents findings from the Girls Shape the Future study, which was designed to evaluate the implementation and effectiveness of the Girls Incorporated Will Power/Won't Power curriculum developed to reduce sexual intercourse, pregnancy, and sexually transmitted infections among teenage girls. The study used two primary methods: an experimental design to assess the effectiveness of the program on outcomes relating to the curriculum model, and an analysis of program implementation to understand whether girls randomly assigned to participate received the intended intervention.