‘Whilst the SDG4 collects statistical data on a range of education issues, it has transformed the technical spaces of data production into venues of deliberation on future policy directions. However, what about what we do not know? This book’s chapters chart in detail the challenges and repercussions of dealing with missing data, missing vulnerable populations, missing national relevance and, ultimately, missing the goal of using data meaningfully to support impactful education policies on the ground. Based on empirical evidence and analysis, and written by education experts working in the field, the book is recommended thoroughly to all those, experts and policymakers alike, that strive so that the SDG4 is not another missed opportunity in the governance of global education.’