Social Identity Theory
Social Identity Theory (SIT) is a psychological framework developed by Henri Tajfel and John Turner beginning in the 1970s to explain how individuals derive aspects of their self-concept from membership in social groups. The theory addresses how people categorize themselves and others into groups based on characteristics such as ethnicity, nationality, profession, or shared interests, and how this categorization influences their behavior, attitudes, and relationships with other groups.
Core Mechanisms
The theory proposes that individuals are motivated to maintain a positive self-image, which they achieve partly through favorable comparisons between their own group (the in-group) and other groups (out-groups). This tendency leads to in-group bias, where people attribute positive qualities to their own group while attributing negative qualities to out-groups. The strength of these biases varies depending on the salience of group identity in a particular context and the importance individuals attach to their group membership.
Applications and Impact
Social Identity Theory has proven influential across multiple disciplines, informing research on prejudice, discrimination, intergroup conflict, and cooperation. The framework has been applied to understand phenomena ranging from workplace dynamics and organizational behavior to nationalism and social movements. The theory also provides insight into how arbitrary group divisions can quickly produce discriminatory behavior, as demonstrated through classic experimental studies on minimal groups.