A paper in the Journal of Development Economics by Noam Angrist and colleagues reviews around 200 impact evaluations in education and identifies the most cost-effective education interventions using a unified metric ('Learning-Adjusted Years of Schooling'). 

The work relates to the What Works Hub for Global Education. It has directly informed the Global Education Evidence Advisory Panel (GEEAP) and related 'smart buys' reports (the GEEAP is a key policy effort to translate evidence into policy insight co-convened by FCDO, the World Bank, USAID, and UNICEF). This work also fed directly into the UNICEF Foundation Literacy and Numeracy Hub evidence menu, the Gates Foundation's latest prioritisation areas in education, and more.