Abstract: In order to assess the internal structure of risk assessment of sexual recidivism of the Sex Offender Risk Appraisal Guide (SORAG), and the STATIC-99, a principal components analysis followed by promax rotation was conducted. In a data set including adults forensic sex offenders, three interpretable components were identified both with the SORAG (n =79) and the STATIC-99 (n =254): “past criminal behaviour”, “demographic characteristics”, and “antisocial personality” for the SORAG and “criminal past behaviour”, “aggressor-victim relationship” and “sexual offence” for the STATIC-99. Prospective data were available (SORAG: n =133; STATIC-99: n =137). For both instruments, the “criminal past behaviour” factor was the only one predicting general recidivism, violent recidivism and sexual recidivism. [Copyright &y& Elsevier]