leading UK university, we present evidence on the effects of class size on students' test scores. We observe the same student …-linear class size effects controlling for unobserved heterogeneity of both individual students and faculty. We find that (i) at the … and largest ranges of class sizes and zero over a wide range of intermediate class sizes; (iii) students at the top of the …

-level factors that shape students' experiences. However, there has been relatively little systematic research on the institutional …