The studies included in this special issue on gene-peer interplay in child and adolescent outcomes can uniformly be described as cutting edge and methodologically sophisticated. When viewed together, they all but conclusively document the presence and importance of gene-peer interplay in child and adolescent outcomes. Nevertheless, more work on…

The eight contributions to this special issue provide an informative focus on many aspects of peer-based victimization in schools. Often using sophisticated quantitative and analytic procedures, they advance our knowledge in several important domains, pointing out important contextual variables, interactions, and mediating factors in the negative…

Harry Stack Sullivan maintained that competition between friends in early adolescence would generally destroy their friendship. Working with early adolescent samples in Canada, Costa Rica, and Cuba, we found that hypercompetitiveness--a form of competition involving the need to prove one?s own superiority--was linked with conflict between friends,…