Teachers toolbox – Professor John Hattie’s Table of Effect Sizes

Professor John Hattie’s Table of Effect Sizes

Hattie says ‘effect sizes» are the best way of answering the question ‘what has the greatest influence on student learning?». An effect-size of 1.0 is typically associated with:

•  advancing learners» achievement by one year, or improving the rate of learning by 50%

•  a correlation between some variable (e.g., amount of homework) and achievement of approximately .50

•  A two grade leap in GCSE, e.g. from a C to an A grade

An effect size of 1.0 is clearly enormous! (It is defined as an increase of one standard deviation)

Below is Hattie’s table of effect sizes.

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