Question

who has given classification of in and out groups​

Answer 1

Answer:

Social Identity Theory Stages

Tajfel and Turner (1979) proposed that there are three mental processes involved in evaluating others as “us” or “them” (i.e. “in-group” and “out-group

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Answer 2

Explanation:

In sociology and social psychology, an in-group is a social group to which a person psychologically identifies as being a member . by a contrast an out-group is a social group with which an individual does not identify