Three studies investigated the determination of social discrimination by the valence of stimuli that are allocated between groups. The studies were based on either the minimal group paradigm or a more reality-based laboratory intergroup setting, with stimulus valence, group status, and group size as factors and with pull scores on Tajfel matrices…

Groups exist in a time environment. The group develops, changes, may function for years, and eventually disbands. The theory of groups across time is in a different psychological domain than that of short-term groups. For example, in long-term groups changes in group membership are inevitable whereas in short-term groups these changes are rarely…

Social identity theory holds that social group memberships become part of the psychological self, affecting thoughts, feelings, and behavior. However, tests of this hypothesis have mainly involved judgmental dependent measures. A method is suggested that can provide more direct evidence. Discusses use of that method. (KW)

Videotaped group work lessons of an elementary school third grade class provide material for study of the non-verbal aspect of group behavior. A system of activity categories is developed and a typology of pupils' working methods in group study distinguishes types and characteristic forms of activity. The following activity categories are used in…