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The Holy Grail of Educational Research
John Hattie A group of researchers headed by John Hattie began a project in 1990, mostly based in Australia to synthesize educational research in a mammoth way that had never been done before. Fifteen years later the results were published under the title of Visible Learning by Professor John Hattie. The study focused on student achievement. What worked best and what didn't work so well were ranked from multiple meta analysis studies. What makes this so impressive is the size of the study. There were over 800 meta-analysis analyzed and synthesized. This included 50,000 studies and many millions of students. Each topic (e.g. class size, retention, teacher clarity etc.) was given a combined effect size score so all efforts toward student achievement could be compared to others as to their effectiveness. With a study this large teachers can see at a glance how some of the methods they are using in the classroom stack up to other competing methods. Plus, we can examine di
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