Offender Assessment System and Offender Group Reconviction Scale: research summaries
Date: 07 December 2009
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)