Journal Article

The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring

Educational Researcher (1984) 13(6) 4-16
DOI: 10.3102/0013189X013006004
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Bloom, B. S. (1984). The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring. Educational Researcher, 13(6), 4–16. https://doi.org/10.3102/0013189X013006004

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