This technical note explains how group membership affects who a person thinks she or he is and how that person behaves in organizations. Hofstedes's levels of identity model are introduced and a simple description of Social Identity Theory is laid out. This note is a helpful tool for discussions about group differences because it argues that identification as a group member is not inconsistent with also being a unique individual. The note was written for use in Interpersonal Behavior and can be useful in a range of organizational behavior courses.