Better evidence for a better world

Campbell evidence and gap maps

Coming soon – Campbell EGMs are a new evidence synthesis product. Plain language summaries of our EGMs will be published on this website. The interactive EGMs and full EGM reports will be available in our journal on the Wiley Online Library platform: click here.



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Other EGMs

Campbell has produced maps on other topics, sometimes in partnership with other organisations.



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Policy brief 4: The effects of sentencing policy on re-offending

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This Campbell policy brief (click on the download/open icons above) summarises evidence from 12 systematic reviews in the Campbell Library which examine sentencing policies and their effects on re-offending. Custodial sentences do not reduce recidivism by any more than non-custodial approaches, which are cheaper and have fewer consequences for offenders’ families. Diverting offenders before they enter the system is likely to produce less offending. Harsh prison regimes such as boot camps are not effective. Evidence also shows that programmes focused on specific issues such as drug use and sex offenders reduce recidivism.

To access the 12 included systematic reviews in full, click on the links below:

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