Plain Language Summaries

Plain Language Summaries of Campbell’s systematic reviews are now available. These summaries are published as part of our commitment to helping people use and interpret research evidence.
Crime and Justice
Education
International Development
Social Welfare

This Campbell systematic review examines the effects of closed circuit television (CCTV) on property crime and violent crime. The review reports on whether using CCTV results in crime displacement, and also assesses whether using CCTV leads to the spread of crime prevention benefits. The authors found 44 evaluations. The studies were from the United Kingdom, the United States of America, Canada, Norway and Sweden. Most of the studies (34) were from the United Kingdom.

This Campbell systematic review assesses the effects of psychosocial interventions for school refusal. The review summarizes the findings from eight studies.

This Campbell systematic review examines the effects of Payment for Environmental Services (PES) programmes on deforestation and poverty, and whether environmental and poverty reduction goals conflict with one another. The review summarizes evidence from 11 studies covering six PES programmes in four countries.

This Campbell systematic review assesses the effects of advocacy interventions on intimate partner violence and women's wellbeing. The review summarizes findings from 13 studies.

Plain Language Summaries of Campbell’s systematic reviews are now available. These summaries are published as part of our commitment to helping people use and interpret research evidence.

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  • Crime and Justice


    Bystander programs increase bystander intervention but no effect on perpetrating sexual assault

    Sexual assault is a significant problem among adolescents and college students across the world. One promising strategy for preventing these assaults is the implementation of bystander sexual assault prevention programs, which encourage young people to intervene when witnessing incidents or warning signs of sexual assault. This review examines the effects bystander programs have on knowledge and attitudes concerning sexual assault and bystander behavior, bystander intervention when witnessing sexual assault or its warning signs, and participants’ rates of perpetration of sexual assault.

    Read the Plain Language Summary

    See the Campbell Review

    See crime and justice summaries
  • Education


    Small class size has at best a small effect on academic achievement

    Increasing class size is one of the key variables that policy makers can use to control spending on education. But the consensus among many in education research is that smaller classes are effective in improving student achievement which has led to a policy of class size reductions in a number of US states, the UK, and the Netherlands. This policy is disputed by those who argue that the effects of class size reduction are only modest and that there are other more cost-effective strategies for improving educational standards. Despite the important policy and practice implications of the topic, the research literature on the educational effects of class-size differences has not been clear. This review systematically reports findings from relevant studies that measure the effects of class size on academic achievement.

    Read the Plain Language Summary

    See the Campbell Review

    See education summaries
  • International Development


    Financial inclusion interventions have very small and inconsistent impacts

    Financial inclusion programmes seek to increase access to financial services such as credit, savings, insurance and money transfers and so allow poor and low-income households in low- and middle-income countries to enhance their welfare, grasp opportunities, mitigate shocks, and ultimately escape poverty. This systematic review of reviews assesses the evidence on economic, social, behavioural and gender-related outcomes from financial inclusion.

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    See the Campbell Review

    See international development summaries
  • Social Welfare


    Interventions to reduce homelessness and improve housing stability are effective

    There are large numbers of homeless people around the world. Efforts to combat homelessness have been made on national levels as well as at local government levels. This review assesses the effectiveness of interventions combining housing programmes with or without case management as a means to reduce homelessness and increase residential stability for individuals who are homeless, or at risk of becoming homeless.

    Read the Plain Language Summary

    See the Campbell Review

    See social welfare summaries
  • Knowledge Translation and Implementation


    Policy briefs make systematic reviews easier to understand but little evidence of impact on use of study findings

    Systematic reviews are long and technical documents that may be hard for policymakers to use when making decisions. Evidence summaries are short documents that describe research findings in systematic reviews. These summaries may simplify the use of systematic reviews. Other names for evidence reviews are policy briefs, evidence briefs, summaries of findings, or plain language summaries. The goal of this review was to learn whether evidence summaries help policymakers use evidence from systematic reviews. This review also aimed to identify the best ways to present the evidence summary to increase the use of evidence.

    Read the Plain Language Summary

    See the Campbell Review

    See KTI summaries

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