This document provides an introduction to bystander intervention. It defines what a bystander is and discusses the difference between passive and active bystanders. The document outlines factors that influence whether a bystander intervenes in a problematic situation or not, such as social influence, fear of embarrassment, and diffusion of responsibility. It emphasizes that bystander intervention does not require confrontation and provides examples of small actions one can take. The document notes that domestic violence, sexual coercion and rape are widespread problems among student populations and discusses why bystander intervention training is relevant for students.