Analysis of meta-meta-analyses

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If you have been intimidated by John Hattie as much as I am (I keep a copy of ‘Visible Learning’ next to my desk to remind me how little I actually know), here is an article that might improve your mood somewhat: Robert Slavin is looking critically at Hattie’s research and the validity of his conclusions. The writer asks a very good question: if Hattie accepted all research regardless of its quality, how can we rely on his results?

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