Class size: What research says and what it means for state policy

In recent decades, at least 24 states have mandated or incentivized class-size reduction. This Executive Summary from the Brookings Institution examines “what the research says” about whether class-size reduction has a positive impact on student learning and, if it does, by how much, for whom, and under what circumstances. 
http://www.brookings.edu/papers/2011/0511_class_size_whitehurst_chingos.aspx

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