The main policy implication of our review is that new anti-bullying programs should be designed and tested based on the key program elements and evaluation components that we have found to be most effective. We recommend that a system of accrediting anti-bullying programs should be developed, supervised by an international body such as the International Observatory on Violence in Schools.
Results obtained so far in evaluations of anti-bullying programs are encouraging.
The time is ripe to mount a new long-term research strategy on the effectiveness of these programs, based on our findings.
The main policy implication of our review is that new anti-bullying programs should be designed and tested based on the key program elements and evaluation components that we have found to be most effective.
We recommend that a system of accrediting anti-bullying programs should be developed, supervised by an international body such as the International Observatory on Violence in Schools.
School bullying has serious short-term and long-term effects on children’s physical and mental health. Various anti-bullying programs have been implemented world wide and, more rarely, evaluated. Previous narrative reviews, summarizing the work done on bullying prevention, as well as previous meta-analyses of anti-bullying programs, are limited. The definition of school bullying includes several key elements: physical, verbal, or psychological attack or intimidation that is intended to cause fear, distress, or harm to the victim; an imbalance of power (psychological or physical), with a more powerful child (or children) oppressing less powerful ones; and repeated incidents between the same children over a prolonged period. School bullying can occur in school or on the way to or from school. It is not bullying when two persons of the same strength (physical, psychological, or verbal) victimize each other.
This report presents a systematic review and meta-analysis of the effectiveness of programs designed to reduce school bullying perpetration and victimization (i.e. being bullied). The authors indicate the pitfalls of previous reviews and explain in detail how the present systematic review and meta-analysis addresses the gaps in the existing literature on bullying prevention.
In the present report, we go beyond previous reviews by: doing much more extensive searches for evaluations such as hand-searching all volumes of 35 journals from 1983 up to the end of May 2009; searching for international evaluations in 18 electronic databases and in languages other than English; and focusing only on programs that are specifically designed to reduce bullying and not aggressive behavior (i.e. the outcome variables specifically measure bullying). Leading researchers in the area of school bullying were also contacted via e-mail.
Studies were included in this review if they evaluated the effects of an anti-bullying program by comparing an experimental group who received the intervention with a control group who did not. The word ‘experimental’ here refers to students who received the program and does not necessarily imply randomization. Four types of research design were included: a) randomized experiments, b) experimental-control comparisons with before and after measures of bullying, c) other experimentalcontrol comparisons and d) quasi-experimental age-cohort designs, where students of age X after the intervention were compared with students of the same age X in the same school before the intervention. Both published and unpublished (e.g. PhD theses) reports were included. Reports concerning an evaluation of a program had to clearly indicate that bullying or victimization were included as outcome measures. Bullying and victimization could be measured using self-report questionnaires, peer ratings, teacher ratings, or observational data.