Bloom's 2 Sigma Problem

Sat, 10 Jan 2026 00:00:00 +0530

In 1984, Benjamin Bloom reported a result that should have reorganised education and mostly didn’t. Students tutored one-to-one under mastery learning performed two standard deviations better than students in an ordinary classroom: the median tutored student outperformed 98% of the control group.

Tutoring on Mereth Labs

Bloom's 2 Sigma Problem