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Risk Assessment in Offenders with Intellectual Disability: A Validation Study ofthe Dutch Version of the Violence Risk Appraisal Guide in Predicting AggressiveIncidentsClaudia Pouls, Knowledge Centre Forensic Psychiatric Care, Lanaken, Belgium(claudia.pouls@opzcrekem.be)In the past years, risk assessment research has been extended to offenders with intellectualdisability (ID). Existing risk assessment tools are now validated and new instruments –specifically for offenders with ID – are being developed. However, most of this research focusesprimarily on the prediction of (long term) recidivism, and relatively little attention has beengiven to the prediction of institutional aggression. The few studies that have been done, showconflicting results. In this presentation, the results of a validation study in a Belgian sample ofoffenders with ID will be presented in the prediction of aggressive incidents. An approved Dutchtranslation of the Violence Risk Appraisal Guide (VRAG), one of the most widely used riskassessment instruments, was scored in 60 forensic ID patients. This sample was then followed upfor a period of 6 months regarding institutional aggression. Although the psychometrics weregood, the VRAG failed to predict aggressive incidents in the clinic. In conclusion, while theVRAG has proven its value to predict aggressive recidivism, the instrument could not reliablypredict aggressive incidents in the current forensic ID sample.The Psychometric Characteristics of the HKT-EX Risk Assessment Tool in aSample of 342 Forensic Psychiatric Patients in the NetherlandsMichelle Willems, Tilburg University (M.Willems@uvt.nl)Stefan Bogaerts, Tilburg University (s.bogaerts@uvt.nl)Marinus Spreen, Dr. S. van Mesdag Forensic Psychiatry Centre, Netherlands(m.spreen@fpcvanmesdag.nl)In the Netherlands, the Dutch risk assessment tool HKT-30 (Historical-Clinical-Future-30) isincreasingly used in forensic psychiatric practice. Currently, the HKT-30 is being revised in alarge research project, for the purpose of which an experimental version of the HKT-30 has beencreated, containing more and other items: the HKT-EX. This study investigated somepsychometric properties of the HKT-EX, namely the factorial structure, the internal consistencyand inter-rater reliability. The study sample consisted of 342 forensic psychiatric patients, whohad been discharged from any of the Dutch maximum-security forensic psychiatric hospitalsbetween 2004 and 2008. The HKT-EX was rated by trained Masters level Psychology studentson the basis of criminal file information. To determine the inter-rater reliability, for 60 patientsthe HKT-EX was rated twice by two different raters. To determine the factorial structure, factor348