Hattie does not define most of the terms in his table. There is also immediate feedback for the learners, and some corrective work if this is necessary. ‘Direct instruction’ is a strategy that includes active learning, structured reviews after one hour, five hours and 20 hours study. Some effect sizes are ‘Russian Dolls’ containing more than one strategy e.g. Hence they are the best guess we have about what has the greatest effect on student achievement. The effect sizes are averaged, and are a synthesis of research studies thought to be well designed and implemented by research reviewers. ‘Number of effects is the number of effect sizes from well designed studies that have been averaged to produce the average effect size.Īn effect size above 0.4 is above average for educational research.An effect size of 1.0 is equivalent to a two grade leap at GCSE.An effect size of 0.5 is equivalent to a one grade leap at GCSE.Terms used in the table (Interpreted by Geoff Petty)
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