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A Year of Desirable Difficulties: The Impact of Interleaving Math Practice in Nigeria

Kremer et al. 2026 · randomised trial · touches 1 claim · used in 1 attack

Which beliefs it touches

C11 Spacing and interleaving sets a limit on it
Year-long school-randomised trial in 62 Nigerian grade-5 maths classrooms (NBER WP, not peer reviewed): interleaved practice +0.28 SD on end-of-term tests, +0.03 SD (ns) on cumulative end-of-year test; lower achievers gained most, possible harm at the top. C11 weakened 2026-10-15 (durability bound).