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Violence risk assessment constitutes a major concern in forensic psychiatry, psychology and related fields. Numerous instruments like the Hare Psychopathy Checklist (PCL-R, Hare, 1991) and the Violence Risk Appraisal Guide (VRAG) have been developed in the aim of improving precision in the prediction of violence. This study assesses the reliability index of the HCR-20 Violence Risk Assessment Scheme and evaluates its relationship with the PCL-R the Buss and Perry's self-report Aggression Questionnaire (AQ) and the type of offenses officially registered. All participants (n = 86) are male adult offenders detained in a Belgian high-security forensic hospital. The mean IQ and age were respectively, 81,03 and 36,71. Items common to these instruments were omitted in order to avoid a circular effect. Results showed that the HCR-20 was significantly related to the PCL-R : the historical factor was strongly …