Impact Evaluations

The 3ie impact evaluation database is an essential resource for policymakers and researchers who are looking for evidence on what works, what doesn’t, and why in development.

The database contains information on over 4,260 impact evaluations and links to the original studies.

Impact evaluations provide the most rigorous evidence of what works in international development because they assess the true impact of an intervention, programme, policy, or project by developing a counterfactual. Counterfactual analysis is the comparison between what actually happened and what would have happened in the absence of the intervention. They use experimental and quasi-experimental methods as well as qualitative analyses.

How this database is organised

Searching in this database will bring up published impact evaluations from the Impact Evaluation Repository as well as completed and ongoing 3ie-Funded Impact Evaluations

  • Studies in the Impact Evaluation Repository are published either as journal articles, books or book chapters, reports, or working papers as part of a working paper series. The Repository contains summaries of all published reports of 3ie-funded studies as well as hundreds of non-3ie funded studies.
  • The 3ie-Funded Impact Evaluations database contains descriptions of ongoing impact evaluations as well as summaries of completed studies.


New on JDEff: Is impact evaluation still on the rise? 

In this journal article, 3ie's Shayda Sabet and FHI360's Annette Brown examine data from our impact evaluation repository to highlight new trends in impact evaluation research. The authors used an updated search and screening protocol to identify new impact evaluation studies published until September 2015 to populate the repository, which contains more than 4,000 records dating back to 1981. They found that the number of studies published between 2010-2015 account for almost two-thirds of the evidence base. Over half of all studies are from health and education sectors, however, in the last decade, more studies from underrepresented sectors are emerging. Nearly 60 per cent of the studies are from Sub-Saharan Africa and Latin America and recent studies are increasingly conducted in underrepresented regions such as Middle East and North Africa. Read more


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