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Does class size influence student achievement?

Abstract : This policy brief presents the results of the most methodologically robust studies that estimate the impact of a reduction in class size on the student achievement and longer-run outcomes. Contrary to an idea that persisted for a long time, the effects are high, if they are compared with those of other educational policies conducted on a large scale and assessed rigorously. The absolute cost of such a policy justifies targeting it on the most disadvantaged pupils, but the investment is profitable whenever the salary gain for two years spent in a half-size class is greater than 1%. However many unknown quantities remain, in particular about how reduction in class size links up with teaching practices.
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Contributor : Caroline Bauer <>
Submitted on : Friday, March 27, 2020 - 8:29:30 PM
Last modification on : Wednesday, January 20, 2021 - 9:54:01 AM


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  • HAL Id : halshs-02522747, version 1



Adrien Bouguen, Julien Grenet, Marc Gurgand. Does class size influence student achievement?. 2017. ⟨halshs-02522747⟩



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