This proposal aims at building the evidence base for the primary prevention of intimate partner violence, including teen dating violence, and/or sexual violence. This funding opportunity will support rigorous outcome evaluations of promising practice-based prevention approaches that are currently being implemented by state and/or local organizations that address intimate partner violence and/or sexual violence. This includes, but is not limited to, organizations that receive funding under CDC’s Rape Prevention and Education Program and CDC’s DELTA AHEAD program. By promising practice-based approaches we mean programs, policies, or practices that can demonstrate the following: (a) Evidence of implementation in the field for a minimum of two years; and (b) Collection of prior positive implementation-related outcomes (e.g., data demonstrating reach, fidelity, availability, and/or acceptability of the approach) and/or collection of outcome monitoring data before and after implementing the approach that demonstrate positive changes in relevant outcomes. Research on promising practice-based prevention approaches will evaluate the effectiveness of prevention approaches that already have traction within the field but have not been rigorously evaluated.