Getting Inside the "Black Box" of Head Start Quality: What Matters and What Doesn't?
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Critics of Head Start contend that many programs spend too much money on programs extraneous to education. On the other hand, Head Start advocates argue that severely disadvantaged children need a broad range of services. Given the available evidence, it has been impossible to assess the validity of
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美国国家经济研究局创建时间：
2003-11-01
