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This study examined peer intervention in bullying using naturalistic observations on school playgrounds. The sample comprised 58 children (37 boys and 21 girls) in Grades 1 to 6 who were observed to intervene in bullying. Peers were present during 88% of bullying episodes and intervened in 19%. In 47% of the episodes, peers intervened aggressively. Interventions directed toward the bully were more likely to be aggressive, whereas interventions directed toward the victim or the bully-victim dyad were more likely to be nonaggressive. The majority (57%) of interventions were effective in stopping bullying. Boys were more likely to intervene when the bully and victim were male and girls when the bully and victim were female. The implications for antibullying interventions are discussed.

The goal of this study was to examine sexual harassment in early adolescence. Available data indicate that peer to peer sexual harassment is prevalent in high school and is associated with psychosocial problems for both victims and perpetrators. For the present study, we adopted a developmental contextual model to examine the possibility that this behavior develops during the late elementary and middle school years and is linked to the biological and social changes that occur at this time. Youths from Grades 6–8 (N = 1,213) enrolled in seven elementary and middle schools in a large south-central Canadian city were asked to report on their sexual harassment behaviors with same- and cross-gender peers; their pubertal development, and the gender composition of their peer network. The results revealed that cross-gender harassment was distinct from same-gender harassment, increased in frequency from Grade 6 to Grade 8, and was linked to pubertal maturation and participation in mixed-gender peer groups. The implications of a developmental contextual model for understanding the emergence of this problematic behavior in adolescence are discussed.

The present study employed naturalistic observations to compare bullying and victimization in the playground and in the classroom. The results indicated that there were more opportunities to observe aggression and receive and initiate aggression in the playground than in the classroom. The frequency of bullying was higher in the playground (4.5 episodes per hour) than in the classroom (2.4 episodes per hour). The nature of bullying reflected the constraints of the context (i.e. direct bullying was more prevalent in the playground and indirect bullying was more prevalent in the classroom). Being at the receiving end of aggression was more likely to occur in the playground as compared to the classroom. Nonaggressive children were more likely to bully in the playground, whereas aggressive children were more likely to bully in the classroom. There was no difference across context in the proportion of episodes of reinforcement with peers present or in the rate of peer and teacher intervention. The results highlight the necessity of a systemic intervention programme that addresses not only the individual characteristics of bullies and victims, but also the roles of the peer group, teachers and the school.

This study examined dating-stage and developmental-contextual models of romantic relationships during early adolescence. Same-gender friendships, affiliation with mixed-gender groups, dating, and romantic relationships were investigated in a sample of 1,284 young adolescents of diverse ethnocultural backgrounds. Data were collected cross-sectionally in Grades 5 through 8, as well as longitudinally in the fall and spring of an academic year. Consistent with a stage model, affiliation with mixed-gender groups and dating were qualitatively distinct activities that were sequentially organized and facilitated the progression from same-gender friendships to dyadic romantic relationships. The results also provide insights on how the developmental context may alter stage pathways: Dating activities were incorporated with mixed-gender affiliations, group-based romantic stages showed more stability than other stages, and the ethnocultural context influenced romantic timing. Finally, results indicated that participation in romantic activities heightened adolescents' future interest in having a romantic relationship.

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The purpose of this research was to describe bullying on the playground The subjects were children observed either bullying or being victimized on the playground. Bullying episodes were identified with 90% inter-rater agreement. Bullying occurred regularly on the playground, approximately once every seven minutes and was of short duration, 38 seconds. The majority of bullying episodes (68%) occurred within 120 feet of the school building. Adults were found to have intervened in 4% of the episodes, while peers intervened in 11% of the episodes. However, adults were more likely to intervene than peers if they were present. Peers were involved in some capacity in 85% of the episodes. Boys bullied more than girls and were more likely to bully victims of the same-sex and repeatedly target the same victim. There were no gender differences in the type of bullying and aggression. Children in the primary and junior grades were equally likely to be involved in bullying and tended to bully students from the same grade level. The results are discussed from an individual difference, socialinteractional, and ecological perspective.