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MENTAL MODEL · M3739

Bloom's 2 Sigma Problem

Bloom's 2 Sigma Problem
TechnicalHigh supportArtificial Intelligence
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Version 1.0.0 · Updated 2026-07-28

CORE DEFINITION

Bloom's 2 sigma problem refers to the educational phenomenon that the average student tutored one-to-one using mastery learning techniques performed two standard deviations better than students educated in a classroom environment. It was originally observed by educational psychologist Benjamin Bloom and reported in 1984 in the journal Educational Researcher. Bloom's paper analyzed the dissertation

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Bloom's 2 sigma problem refers to the educational phenomenon that the average student tutored one-to-one using mastery learning techniques performed two standard deviations better than students educated in a classroom environment. It was originally observed by educational psychologist Benjamin Bloom and reported in 1984 in the journal Educational Researcher. Bloom's paper analyzed the dissertation

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Benjamin Bloom discovered that students receiving one-on-one tutoring or mastery learning performed on average about two standard deviations (2 sigma) higher than students in conventional instruction, i.e., reaching the top 2%. This indicates that high-quality personalized instruction can substantially raise overall performance, but the cost is extremely high and difficult to scale.

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Source support: Explicit

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    en.wikipedia.orghttps://en.wikipedia.org/wiki/Bloom%27s_2_sigma_problemZH · Explicit
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