The prevalence of bullying worldwide is high (UNESCO, 2018). Over the past decades, many anti-bullying interventions have been developed to remediate this problem. However, we lack insight into for whom these interventions work and what individual intervention components drive the total intervention effects. We conducted a large-scale individual…

Bullying is a public health priority but to date, there is a lack of evidence-based anti-bullying programmes or interventions designed for use in special schools. KiVa is a successful anti-bullying programme for mainstream schools currently used in 23 countries. This brief paper outlines the co-development and adaptation of two KiVa lessons into…

Social dominance goals have been conceptualized as orientations toward powerful and prominent positions in the peer group. Although previous studies have identified social dominance goals as one of the main motivations behind bullying, few studies have disentangled the time-invariant (average level) from the time-varying (year-to-year) effects of…

During four decades, numerous school-based bullying prevention programmes have been developed and evaluated. Meta-analyses indicate that such programmes have positive average effects, as compared with treatment as usual. However, the effects are small to moderate, and they are especially weak among some specific groups, such as adolescents. After…

The current study examines whether peer victimization experienced in early adolescence is associated with compromised social functioning 14 years later in young adulthood. The sample involved 1533 young adults (65.1% female, M[subscript age] = 27.06) who had participated in a large research project as middle school students (7th and 8th graders,…

Bullying is a major health problem. The KiVa antibullying program has been evaluated in Finland and other European countries, showing preventive effects on self-reported bullying victimization and perpetration. No evaluations of this program have been conducted in Latin America. A cluster randomized controlled trial was conducted at socially…

The long-term sustainment of bullying prevention programs has rarely been investigated. This study addresses this gap by identifying facilitators and barriers to the systematic implementation of KiVa antibullying program in real-life conditions, after an evaluation trial. The study is based on focus group interviews with teachers from 15 Finnish…

We examined the moderating effect of guilt on the associations between moral disengagement and bullying, defending and outsider behaviors in a sample of 404 students (203 boys; M[subscript age] = 11.09 years; SD = 1.48). Bullying, defending and outsider behavior were assessed through peer nominations, whereas guilt and moral disengagement were…

The aim of this study was to determine how trajectory clusters of social status (social preference and perceived popularity) and behavior (direct aggression and prosocial behavior) from age 9 to age 14 predicted adolescents' bullying participant roles at age 16 and 17 (n = 266). Clusters were identified with multivariate growth mixture modeling…

Defending peers who have been bullied is often thought to put defenders at risk of becoming victimized themselves. The study investigated the concurrent and prospective associations between defending and (peer- and self-reported) victimization, and examined popularity and classroom norms as potential moderators. Participants included 4085 Finnish…

Sharing a classroom environment with other victimized peers has been shown to mitigate the adverse effects of peer victimization on children's social and psychological adjustment. By extension, this study hypothesized that classroom reductions in the proportion of victims would be harmful for children who remain victimized. Data were collected at…

We analyzed developmental changes in outsider behavior, testing whether the likelihood that it turns into bullying or defending over time depends on the individual proneness to feel shame or guilt. Participants were 155 preadolescents (72 boys and 83 girls; [X-bar][subscript age] at T1 = 10.74 years). Bullying, defending, and outsider behaviors…

In order to battle bullying, it can be important for students to have teachers whom they see as taking an active stand against bullying in terms of propagating antibullying norms and having an efficacious approach to decreasing bullying. This expectation was tested with data from the control schools of the Finnish evaluation of the KiVa…

This article provides a view of school bullying as a group phenomenon and practical implications stemming from this approach. The motivation for bullying perpetration often relates to one's social standing in the group. Peer bystanders are typically present when bullying takes place, often providing the perpetrators with social rewards. The…

This study examined whether the degree to which bullying is normative in the classroom would moderate associations between "intra"- (cognitive and affective empathy, self-efficacy beliefs) and "inter"personal (popularity) factors and defending behavior. Participants were 6,708 third- to fifth-grade children (49% boys;…