The International Initiative for Impact Evaluation (3ie) is an international grant-making NGO promoting evidence-informed development policies and programmes. We are the global leader in funding and producing high-quality evidence of what works, how, why and at what cost. We believe that better and policy-relevant evidence will make development more effective and improve people's lives. 3ie quality-assured systematic reviews 3ie-supported systematic reviews follow scientifically recognised

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... w methods, and are peer-reviewed and quality assured according to internationally accepted standards. Each review is independently reviewed by a subject specialist and an expert in systematic review methodology. 3ie provides this quality assurance as a service for reviews funded directly by the UK Department for International Development (DFID). By agreement, 3ie is publishing final versions on its website as they are received from DFID. 3ie does not copy-edit or format them to 3ie style.