John Hattie developed a way of ranking various influences in different meta-analyses according to their effect sizes. In his ground-breaking study “Visible Learning” he ranked those influences which are related to learning outcomes from very positive effects to very negative effects on student achievement. Hattie found that the average effect size of all the interventions he studied was 0.40. Therefore he decided to judge the success of influences relative to this ‘hinge point’, in order to find an answer to the question “What works best in education?”

Hattie studied six areas that contribute to learning: the student, the home, the school, the curricula, the teacher, and teaching and learning approaches. But Hattie did not merely provide a list of the relative effects of the different influences on student achievement. He also tells the story underlying the data. He found that the key to making a difference was making teaching and learning visible. He further explained this story in his book “Visible learning for teachers“.

Here is an overview of the Hattie effect size list that contains 138 influences and effect sizes across all areas related to student achievement. The list visualized here is related to Hattie (2009) Visible Learning. Hattie constantly updates this list with more meta studies. You can find an updated version in Hattie (2011) Visible Learning for Teachers.

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Hi there – thanks for sharing the graphic – not sure if someone has already pointed out to you the error. You have “Classroom Behavioural” with an effect size of 0.8

I was looking for Classroom Discussion and assume you must have got those mixed up. Classroom Behavioural has an effect size of only 0.62.

Hope this helps with a revision of the graphic – cheers

Hi Tom,

Thanks for pointing that out! I double checked the issue with Hattie’s two books about “Visible Learning”.

The list I visualized for this website is related to Hattie (2009) Visible Learning.

Hattie constantly updates his list with more meta studies. I suggest that your comment relates to an updated list in Hattie (2011) Visible Learning for Teachers?

Cheers, Sebastian

Can someone help me please? I have seen many different tables of Hattie’s effect sizes and the order and effect size seems to differ quite significantly between them. Why is this? I am trying to use them for an evaluative model and I am confused as to which order and effect size I should use.

With thanks for any clarification you can offer.

Hi Clare,

As Hattie has updated the ranking in his newer books I would recommend to use the latest version of the list in “Visible Learning for Teachers” which cites over 900 meta studies.

Hi,

I’ve been reading a book called Spark, by John Ratey. In it, he argues that cardio exercise has a large influence on student success. Does anyone know where this might fit into Hattie’s effects, or any related studies?

I note that peer tutoring has a 0.55 effect but mentoring which Hattie states is a form of peer tutoring has a 0.15 effect. How can there be this level of difference? One could assume from this that mentoring is not a particularly worthwhile investment but there would be few people who have achieved eminence in their fields who were not heavily influenced by a mentor.

Hello, I am about to buy the book but I wondered if someone could just quickly fill me in here on what statistic is being used to represent the effect size, e.g. r or r^2 or z? Thanks.

Hello Daniel,

Hattie uses Cohen’s d to represent the effect size. Cohen’s d is defined as the difference between two means divided by a standard deviation of the pooled groups or of the control group alone.

Cheers, Sebastian