The International Initiative for Impact Evaluation (3ie) promotes evidence-informed equitable, inclusive and sustainable development. We support the generation and effective use of highquality evidence to inform decision-making and improve the lives of people living in poverty in low-and middle-income countries. We provide guidance and support to produce, synthesise and quality-assure evidence of what works, for whom, how, why and at what cost. 3ie working papers These papers cover a range of content. They may focus on current issues, debates and enduring challenges facing development policymakers, programme managers, practitioners, and the impact evaluation and systematic review communities. Policy-relevant papers in this series synthesise or draw on relevant findings from mixed-method impact evaluations and systematic reviews funded by 3ie, as well as other rigorous evidence, to offer new analyses, findings, insights and recommendations. Papers focusing on methods and technical guides also draw on similar sources to help advance understanding, design, and use of rigorous and appropriate evaluations and reviews. 3ie also uses this series to publish lessons learnt from 3ie grant-making. About this working paper This paper, Transparency and accountability in the extractives sector: a synthesis of what works and what does not, uses evidence from seven rigorous impact evaluations of information disclosure and deliberation interventions in the extractives sector. It discusses the impact of these interventions on increasing citizens' knowledge, awareness, trust, and demand for accountability and civic action, as well as their implications for public service delivery, and environmental and development outcomes.