An enduring question in education is whether team-based peer learning methods help improve learning outcomes among … students. We randomly assign around 10,000 middle school students in Karnataka, India, to alternative peer learning treatments … statistically and economically significant for students at the bottom of the ability distribution. We develop theoretical conditions …

and years. I study a mandatory freshmen week for first-year undergraduates and exploit the random assignment of students ….e. very high or low levels of average peer ability in a group harm students' grades. These effects are most pronounced for low …-ability students. …