What Works in Reducing Reoffending: A Global Perspective

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Evidence comes by replication• More than 700 more or less well controlledevaluations of correctional treatmentworldwide• Majority from North America• For nearly all programmes: positive vs. zeroor sometimes even negative effects• Many factors are relevant: Methodology,samples, context, culture, staff motivation,implementation a.s.f.• No sound conclusions from one s<strong>in</strong>gle study• Systematic reviews/meta-analyses of goodquality primary studies
Study Quality: Maryland Scale(Sherman et al., 1997, modified)1. No control/comparison group (CG)2. Nonequivalent CG (e.g., refusers)3. CG judged to be equivalent (e.g.,comparison of offender characteristics)4. Systematic strategy applied to achieveequivalence (e.g., match<strong>in</strong>g)5. Randomized assignment (not impairedby attrition etc.)
Page 2 and 3: Offender Rehabilitation:Recent Hist
Page 4 and 5: England & Wales: National Offender
Page 8: Mean Effect Sizes (d) in Meta-Analy
Page 11 and 12: Mean Effect Sizes (d) in Meta-Analy
Page 13 and 14: Recidivism Rates(Length of follow u
Page 15 and 16: Mean Effect Sizes of OffenderRehabi
Page 17 and 18: What works:Relatively consistent po
Page 19 and 20: Promising: Not yet well-replicateda
Page 21 and 22: The Good Lives Model (Ward, 2002):N
Page 23 and 24: Principles of Appropriate Offender
Page 25 and 26: Criteria of the Correctional Servic
Page 28 and 29: Accredited Programmes in E & W (2)S
Page 30 and 31: Adult Re-offending Rates in E & WNu
Page 32 and 33: Re-offending rates for offending be
Page 34 and 35: Conclusions for internationalpracti
Page 36 and 37: Factors that have an impact beyondp
Page 38 and 39: Problems of transnational transfer
Page 40 and 41: Incarceration Rates in EuropePer 10
Page 42 and 43: : England & Wales
Page 44 and 45: Conclusions and Perspectives (1)•
Page 46: Contact:starr@crim.cam.ac.ukfal23@c

What Works in Reducing Reoffending: A Global Perspective

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