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 …

"We study how class size and class composition affect the academic and labor market performance of college students … random assignment of students to teaching classes. We find that a one standard deviation increase in class-size results in a … males and lower income students. Also, the effects of class composition in terms of gender and ability appear to be inverse …