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
According to SIT, social identity operates through several key processes. Individuals tend to favor their own groups (in-group bias) and may discriminate against out-groups to maintain positive self-esteem. The theory proposes that people are motivated to achieve or maintain a positive social identity by making favorable comparisons between their own group and other groups. This can lead to intergroup conflict when groups compete for status or resources.
Empirical Development
The theory emerged from Tajfel and Turner’s minimal group experiments, which demonstrated that people show preference for in-group members even when group assignments are arbitrary or based on trivial criteria. These findings suggested that social categorization alone is sufficient to trigger in-group favoritism, independent of realistic competition or personal relationships. Subsequent research has applied SIT to understanding phenomena including organizational behavior, ethnic relations, and collective action.