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The Campbell Collaboration is an international social science research network that produces high quality, open and policy-relevant evidence syntheses, plain language summaries and policy briefs.

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Better evidence for a better world

A systematic review is an academic research paper that uses a method called 'evidence synthesis', which can include meta-analysis, to look for answers to a pre-defined question. The purpose of a systematic review is to sum up the best available research on that specific question. Reviews can also show when there has not been enough research carried out, and where more research is needed.

An evidence and gap map is a visual presentation of the available rigorous research evidence for a particular policy domain. An EGM consolidates what we know and do not know about ‘what works’, and provides a graphical display of areas with strong, weak or non-existent research evidence on the effect of interventions or initiatives.

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