This document provides information about bystander intervention and social norms. It discusses how social norms are constructed and influence behavior, using examples like "lad culture". Unacceptable behaviors like harassment and sexual assault are shown to exist on a spectrum, and bystander intervention can help shift the norm towards healthy behaviors. The document advocates consistently reinforcing that harmful behaviors are unacceptable in order to change social perceptions and discourage such actions. Role plays demonstrate intervening when witnessing inappropriate language or attitudes. The goal is to describe how social norms impact society and how positive intervention can change norms and prevent problematic behaviors.