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Julia dimly suspected, and research by Harris Cooper of Duke University confirms, that there is only a tenuous correlation between how much homework elementary students do and how well they do on tests of the material or with other measures of achievement. She also suspected that this nightly homework ordeal served other purposes—to convince parents that their kids are getting a suitably rigorous education; to introduce the children to their future lives as spiritually crushed drones; or, more positively, to introduce children to the study habits they would need later in life.
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David Brooks (The Social Animal: The Hidden Sources Of Love, Character, And Achievement)