These papers cover a range of content. They may focus on current issues, debates and enduring challenges. Policy-relevant papers in this series synthesise or draw on relevant 3ie-funded studies and reviews, as well as other rigorous evidence, to offer new analyses, findings, insights and recommendations. Methods papers and technical guides help advance understanding, design, and use of rigorous and appropriate evaluations and reviews. 3ie also uses this series to publish lessons learned from 3ie grant-making.