Social Identity Theory, proposed by Henri Tajfel and John Turner, suggests that individuals' self-concept is influenced by their social group memberships and the value and distinctiveness of those groups.

Self-Categorization Theory, developed by John Turner and colleagues, emphasizes that individuals' social identity is primarily determined by their membership in social groups.

In Social Identity Theory, in-group bias refers to the tendency to favor one's own social group over other groups, leading to positive evaluations of the in-group and negative evaluations of out-groups.

Identity Fusion Theory, proposed by Marilynn Brewer and Wendi Gardner, posits that individuals can fuse their personal identity with their social group identity, resulting in a strong sense of oneness with the group and its values.

Social Identity Complexity Theory, developed by Michael Hogg and Dominic Abrams, proposes that individuals can have multiple, distinct social identities, and the extent to which these identities are salient and interconnected is referred to as social identity complexity.

Social Identity Theory emphasizes the role of social comparison, where individuals compare their own social group to other groups in terms of status, power, and other relevant dimensions.

Self-Categorization Theory highlights the process of social categorization, where individuals mentally group themselves and others into social categories based on shared characteristics or group membership.

Social Identity Theory suggests that individuals' social identity is shaped by their perception of the distinctiveness and uniqueness of their social group, which can lead to positive self-evaluation and in-group favoritism.

Identity Fusion Theory emphasizes the concept of identity fusion, which refers to the strong emotional connection and sense of oneness that individuals experience with their social group, leading to a merging of personal and group identities.

Social Identity Complexity Theory suggests that higher social identity complexity, characterized by multiple and distinct social identities, is associated with lower levels of intergroup bias and prejudice.

Social Identity Theory proposes that individuals' social identity is shaped by their perception of the status and power of their social group, which can lead to positive self-evaluation and in-group favoritism.

Self-Categorization Theory highlights the process of social identification, where individuals mentally represent themselves as members of a social group, leading to a sense of belonging and shared identity.

Social Identity Theory proposes that individuals' social identity is shaped by their perception of the permeability of their social group boundaries, which can influence the strength of their identification with the group.

Identity Fusion Theory emphasizes the process of identity fusion, where individuals' personal identity becomes indistinguishable from their social group identity, leading to a strong sense of oneness with the group.

Social Identity Complexity Theory suggests that higher social identity complexity, characterized by multiple and distinct social identities, is associated with higher levels of self-esteem and self-worth.