This briefs integrates and synthesizes an array of research about who helps others and under what conditions and discusses the implications of this research for a bystander intervention focused prevention agenda to reduce sexual and relationship violence in schools and communities. It combines an examination of bystander helping behavior in the specific context of sexual and relationship violence with social psychological research on bystander behavior outside that context in order to inform prevention efforts. This briefs is designed for researchers, practitioners, and students concerned about violence prevention and who are interesting in bystander intervention as a promising prevention strategy. Connections between research and practice are the foundation of this briefs. The briefs addresses the following questions: What is the promise of a bystander approach to violence prevention? Where does it fit within the spectrum of sexual and relationship violence prevention? How do we expand theoretical models of helping behavior to the unique context of interpersonal violence? How can we bring in research from other areas of health behavior change and developmental research on violence to inform a broader bystander action model? It provides a new synthesis and model of bystander interaction. It outlines a strategic plan for new research and next steps in prevention practices.