This book provides a thorough review of the research literature on the effect of school size in primary and secondary education on three types of outcomes: student achievement, non-cognitive outcomes and costs per student. Based on 84 scientific publications and several prior reviews, the book discusses four main areas: the impact of school size on cognitive learning outcomes and non-cognitive outcomes; the "state of the art" of empirical research on economies of size; the direct and indirect impact of school size, conditioned by other school context variables on student performance and the...