Providing a comprehensive introduction to the topic of accountability and datafication in the governance of education, the World Yearbook of Education 2021 considers global policy dynamics and policy enactment processes. Chapters pay particular attention to the role of international organizations and the private sector in the promotion of performance-based accountability (PBA) in different educational settings and at multiple policy scales. Organized into three sections, chapters cover: the global/local construction of accountability and datafication; global discourse and national translations of performance-based accountability policies; and enactments and effects of accountability and datafication, including controversies and critical issues. With carefully chosen international contributions from around the globe, the World Yearbook of Education 2021 is ideal reading for anyone interested in the future of accountability and datafication in the governance of education.