222 Authors’ Note: This study was conducted with financial support from the Research and Documentation Center of the Dutch Ministry of Justice. International Journal of Offender Therapy and Comparative Criminology Volume 52 Number 2 April 2008 222-233 © 2008 Sage Publications 10.1177/0306624X07303876 http://ijo.sagepub.com hosted at http://online.sagepub.com Aggression Control Therapy for Violent Forensic Psychiatric Patients Method and Clinical Practice Ruud H. J. Hornsveld Henk L. I. Nijman Radboud University Nijmegen, Netherlands Clive R. Hollin University of Leicester, United Kingdom Floor W. Kraaimaat Radboud University Nijmegen, Netherlands Aggression control therapy is based on Goldstein, Gibbs, and Glick’s aggression replace- ment training and was developed for violent forensic psychiatric in- and outpatients (ado- lescents and adults) with a (oppositional–defiant) conduct disorder or an antisocial personality disorder. First, the conditions for promoting “treatment integrity” are exam- ined. Then, target groups, framework, and procedure are described in detail, followed by the most important clinical findings during the period 2002 to 2006. Finally, new pro- gramme developments are mentioned, with aggression control therapy as a starting point. Keywords: aggression; cognitive–behavioral programme; treatment integrity B ecause there was no treatment programme for Dutch violent forensic psychiatric patients, a start was made with the development of the aggression control ther- apy in 2000 (Hornsveld, 2004a). The therapy was founded on the aggression replace- ment training (ART) of Goldstein, Glick, and Gibbs (1998). In the Netherlands, forensic psychiatric patients are offenders for whom, based on examination by a psy- chiatrist and/or a psychologist, a judge has established a connection between a “defi- cient mental development or mental disorder” and a committed offence. The aggression control therapy was initially meant for adult inpatients “detained under hospital order,” but after some time it was also applied to violent adolescent and adult outpatients.