From Georgetown University

A study of the Tulsa, Okla., universal pre-Kindergarten program. The study demonstrates the benefits, at kindergarten entry, for children of diverse economic and racial backgrounds.
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From the National Institute for Early Education Research

A summary of the research on the benefits of pre-K in children from middle-income families.
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A summary of the research on targeted pre-K programs versus voluntary, universal pre-K programs.
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From the Economic Policy Institute

A cost-benefit analysis of high-quality pre-K, comparing targeted and voluntary, universal programs.
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