The Olweus Bullying Prevention Program has been evaluated numerous times both by independent institutes and researchers and by Dan Olweus and his research team.The latest and possibly most comprehensive evaluation was made by Cambrige Institute of Criminology scientists Ttofi MM., Farrington, DP and Baldry, AC upon request from the Swedish National Council on Crime Prevention (Brottsförebyggande Rådet, BRÅ, www.bra.se).

This metastudy scrutinizes 30 implementations of programs against bullying and finds that six of them have clearly more benficial effects that the others. All these six are implementations of the Olweus Program.

Ttofi, Farrington and Baldry finds that components like improved playground supervision, disciplinary methods, school conferences, information for parents, classroom rules and classroom management all are components which are associated with lower levels of bullying. In addition to pointing at specific components, the report concludes that the duration and intensity of the program in the school has an impact on the reduced levels of bullying.