A couple of days ago, I wrote this post The EEF were even more wrong about ability grouping than I realised which revealed that the Education Endowment Foundation, a government funded body looking at what works in schools, had through a series of mistakes and poor decisions, managed to turn a positive effect size of 0.12 for “ability grouping” into a negative effect size of -0.09 for “setting and streaming” and managed to obscure that they had done this. This figure was then widely shared with schools as evidence in favour of mixed ability teaching, for instance, headteacher Stuart Lock told me that the claim that the effect size was negative was shared with 150-200 headteachers at an event organised by a Regional Schools Commissioner.
Nobody has found any problem with the content of my analysis. The result was shared by schools minister Nick Gibb in this tweet:
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