Social norms are a powerful force in organizations. While different literatures across fields have developed differing definitions and categories, social norms are commonly defined as and divided into descriptive norms, i.e., the most commonly enacted behavior, and prescriptive norms, i.e., the behavior most commonly viewed as acceptable or appropriate. Different literatures have also led to differing focuses of investigation for social norms research. Economic theorists have tended to examine social norm emergence by studying how social norms evolve to reduce negative or create positive externalities in situations. Organizational theorists and sociologists have instead focused on the social pressures which maintain social norms in groups over time, and eventually can lead group members to internalize the social norm. In contrast, social psychologists have tended to focus on how to use social norms in interventions aimed at reducing negative behaviors. Integrating these divergent streams of research proves important for future research.