92 7–9-year-old children (47 girls) were observed while attempting to join 2 relatively unfamiliar same- or opposite-sex peers who were playing a board game. Female guests were less obtrusive than male guests in their entry approaches, whereas male guests were more active and assertive. Guests were less behaviorally constrained when approaching same- than opposite-sex hosts. Female hosts were more attentive to the guests than male hosts, who tended to ignore the newcomers. Successful guests received initiations from the hosts, responded contingently to host initiations, and performed activity-related behavior. Since female hosts initiated more behavior to the guests than male hosts, and female guests were more contingently responsive than male guests, girls entering female groups were the most successful. These findings support the thesis that peer group entry processes and outcomes are affected by the personal characteristics and contexts of both the entering children and their hosts.