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Offender Assessment System and Offender Group Reconviction Scale: research summaries

Date: 07 December 2009

Summaries of research on the Offender Assessment System (OASys) and the Offender Group Reconviction Scale (OGRS), risk assessment tools used by the prison and probation services to predict reoffending.

OASys is an IT-based risk and needs assessment tool; OGRS is a risk assessment measure used to predict the likelihood of reoffending. The OASys Data Evaluation and Analysis Team carried out research over a three-year period on the reliability and validity of OASys as an evidence-based assessment, and separate research was done to update OGRS to reflect changing patterns of offending.

The eight research summaries describe the findings from the different studies.

• Can OASys deliver consistent assessments of offenders? Results from the inter-rater reliability study (PDF 0.39mb 3 pages)
• Improving the prediction of reoffending using the Offender Assessment System (PDF 0.28mb 3 pages)
• The coverage and representativeness of OASys risk and need offender profiles: 2007 probation commencements and sentenced prisoner receptions (PDF 0.24mb 6 pages)
• Findings from the measurement of OASys completion rates (PDF 0.25mb 2 pages)
• Predicting reoffending with the OASys self-assessment questionnaire (PDF 0.29mb 4 pages)
• The internal reliability and construct validity of the Offender Assessment System (OASys) (PDF 0.29mb 4 pages)
• OGRS 3: the revised Offender Group Reconviction Scale (PDF 0.16mb 6 pages)
• Measuring changes in risk and need over time using OASys (PDF 0.31mb 4 pages)