This report presents findings from the implementation evaluation of Re:MIX, a sexual health education program aimed at reducing rates of unplanned pregnancy and sexually transmitted infections (STIs). Re:MIX was implemented in Travis County, Texas (which includes the city of Austin) with a population of mostly Latino students in grades 8–10. The implementation evaluation was conducted as part of cluster-level randomized controlled trial of Re:MIX performed under a grant from the Office of Population Affairs (OPA) (formerly the Office of Adolescent Health) in the U.S. Department of Health and Human Services (HHS). This report includes information on the Re:MIX intervention, the comparison condition, and the contextual factors that affected the way Re:MIX was delivered to participants. The report also addresses research questions relate to the population served; program adherence, dosage, and quality; and information on the counterfactual and context.