Dr. Casper’s Child and Adolescent Peer Relations and Interactions (CAPRI) Research Lab involves research at the interface of traditionally “positive” (e.g. friendships) and “negative” (e.g. antipathetic relationships, enmities, victimization, bully/victim relations) adolescent and emerging adult peer relationships and interactions. A more specific focus is on the different roles that members of the peer group play when aggression or bullying occurs in the school context and the social-psychological implications of these interactions for the peer group members.