Children between three and nine years of age were randomly assigned to so-called fast or slow teams and were asked to make self- and intergroup evaluations. Five year olds had high self-evaluations, strong in-group bias, and high group cohesion regardless of which group they were in. (BC)

Investigated the relationship between peer group identification and similarity between individuals involved in problem behavior, and whether group identification moderated group influence on development of delinquent behavior among Italian sixth- and seventh-graders. Found that group behavior interacted with reciprocity of group nominations in…