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There is a growing interest in 'evidence-based policy making' in the UK. However, there remains some confusion about what evidence-based policy making actually means. This paper outlines some of the models used to understand how evidence is thought to shape or inform policy in order to explore the assumptions underlying 'evidence-based policy making.' By way of example, it considers the process of evidence seeking and in particular the systematic review as a presumed 'gold standard' of the EBP movement. It highlights some of the opportunities and challenges represented in this approach for policy research. The final part of the paper outlines some questions of capacity that need to be addressed if the social sciences are to make a more effective contribution to policy debate in Britain.

English
This article addresses the synthesis and use of research evidence to inform policy and practice. Reviews of the evidence base in many fields have formed a crucial bridge between research, policy making and practice. Systematic review, in conjunction with meta-analysis, has become an established methodology for locating, selecting, appraising and quantitatively synthesising research evidence according to an explicit and reproducible methodology. However, the 'standard' systematic review template associated with the Cochrane Collaboration is often criticised for its perceived inability to cope with variation in study design, nature of evidence and study context. We present five approaches to research synthesis, conducted in different fields, using contrasting methodologies. A number of methodological, practical and strategic implications of conducting research syntheses are explored. The article aims to stimulate debate about what counts as good-quality synthesis, and to demonstrate the growing diversity in its practice. In so doing, the article offers researchers and commissioners a range of approaches to producing reviews of the evidence base.

Funding: Funding for this work was received from the MRC-NIHR UK Methodology Research Programme in response to an open commissioned call for an effect size methodology state-of-the-art workshop. The Health Services Research Unit, Institute of Applied Health Sciences (University of Aberdeen), is core funded by the Chief Scientist Office of the Scottish Government Health and Social Care Directorates. The funders had no involvement in study design, collection, analysis, and interpretation of data; reporting; or the decision to publish. ; Peer reviewed ; Publisher PDF