Abstract: The subjective group dynamics model (SGD) explores the relation between evaluations of groups and group members in an intergroup context. It proposes and tests a series of theoretical hypotheses about the relations among intergroup bias, differential evaluation and awareness of differential inclusion which are the three core variables and other related factors. SGD is based on theories such as social identity theory, the complexity-extremity hypothesis and the attitude polarization model, the black sheep effect and the development of person perception. This model deepens our understanding of the ingroup favoritism effect, gives support to social cognitive domain theory, and opens a new path to the research of peer rejection from the perspective of group processes, and it also explains the group homogeneity effect and modifies the cognitive developmental theory. Further exploration is needed on topics such as testing the model in different cultural contexts, improving its structure, and studying its relations with other related variables.

Key words: the black sheep effect, intergroup differentiation, intragroup differentiation, awareness of differential inclusion (ADI), differential evaluation