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Brother William
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Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement, by John Hattie

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The variation in teacher effectiveness is much greater for mathematics than reading outcomes (11 percent on average for mathematics compared to seven percent for reading).
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Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement
Visible Learning: A Synthesis of Over 800 Meta-Analyses Relating to Achievement
by John Hattie
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