Bystander intervention offers promise as a sexual violence prevention tool for student affairs administrators on college campuses, but the conceptualization and definition of the approach is in its infancy and needs further development. In an effort to emphasize the potential role of bystanders in the primary prevention of sexual violence, we put forth the "engaging bystander approach" (EBA). We discuss how EBA can be used to address primary prevention and present updated versions of Banyard, Plante, and Moynihan's (2005) Bystander Attitude Scale and Bystander Behavior Scale. We then present the results from a quantitative study with 951 undergraduate students that used the updated scales to assess the willingness of incoming college students to engage in primary prevention bystander behaviors. We conclude with implications for future studies and for sexual violence prevention programs on college campuses. (Contains 5 tables.)