Many bullying prevention approaches are not delivering the desired results. This presentation will explore the effectiveness of empowering bystanders to interrupt, prevent and stop bullying and cyber-bullying. We will highlight our NREPP evidence-based Safe School Ambassadors program as one of several best-practice models. We will introduce the data-gathering app that student ambassadors safely use to record their interventions. Developed in partnership with Sprigeo, the app provides reliable data to measure school climate and intervention effectiveness.