The No Blame Approach is radical and ameliorative and models a pro-social response to bullying. Sullivan, Cleary and Sullivan (2004) Bullying in Secondary Schools, London. Paul Chapman.
In a study in Germany of 220 cases there was an 87.3% success rate and about half the cases were reported to have been long standing.
Heike Blum and Detlef Beck, No Blame Approach Germany, www.no-blame-approach.de