![]() ![]() Part of Hattie’s appeal to educators is that his conclusions are so easy to understand. He is merely shoveling meta-analyses containing massive bias into meta-meta-analyses that reflect the same biases. ![]() ![]() And sure enough, Hattie is profoundly wrong. My colleague, Marta Pellegrini from the University of Florence (Italy), helped me track down the evidence behind Hattie’s claims. However, operating on the principle that anything that looks to be too good to be true probably is, I looked into Visible Learning to try to understand why it reports such large effect sizes. How wonderful to have every known variable reviewed and ranked! Hattie is a great speaker, and many educators love the clarity and simplicity of his approach. The book ranks factors from one to 138 in terms of their effect sizes on achievement measures. He uses a method called “meta-meta-analysis,” averaging effect sizes from many meta-analyses. He is famous for a book, Visible Learning, which claims to review every area of research that relates to teaching and learning. John Hattie is a professor at the University of Melbourne, Australia. ![]()
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