The evidence on ability grouping appears relatively well-known. The EEF Toolkit summarise the research findings thus:
Overall, setting or streaming appears to benefit higher attaining pupils and be detrimental to the learning of mid-range and lower attaining learners. On average, it does not appear to be an effective strategy for raising the attainment of disadvantaged pupils, who are more likely to be assigned to lower groups.
It appears that children who are deemed to be ‘low ability’ fall behind pupils with equivalent prior attainment at the rate of 1-2 moths per year when placed in…
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