Schools whose students spend more hours on homework and other study time set by teachers tend to perform better …

„Schools whose students spend more hours on homework or other study set by teachers tend, on average, to perform better, even after accounting for the socio-economic status and demographic background of students and schools and various other school characteristics“
OECD (Hrsg.), „Lessons from PISA 2012 for the United States“ (2013), S. 47