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

Benjamin S. Bloom
Educational Researcher
Vol. 13, No. 6 (Jun. - Jul., 1984), pp. 4-16
Stable URL: http://www.jstor.org/stable/1175554
Page Count: 13
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The 2 Sigma Problem: The Search for Methods of Group Instruction as Effective as One-to-One Tutoring
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