https://wol.iza.org/uploads/articles/190/pdfs/class-size-does-it-matter-for-student-achievement.pdf https://wol.iza.org/uploads/articles/190/pdfs/class-size-doe

https://wol.iza.org/uploads/articles/190/pdfs/class-size-does-it-matter-for-student-achievement.pdf https://wol.iza.org/uploads/articles/190/pdfs/class-size-doe... The idea that class size reduction is a highly effective educational intervention is at best ambiguously supported by the (many) studies of it. And it's a super expensive intervention.