In a recent blog on his Brookings Institution site, Grover Whitehurst claims that the preponderance of scientific evidence does not indicate lasting positive benefits from preschool. Others disagree, he says, because they are not as “picky” about the evidence. As there is no disputing taste, I assume he means that the research he prefers is more rigorous and relevant, not just better aligned with his personal preferences. Hence, we would be looking for a valid and reliable process when he arrays the research and grades each study.
Please visit National Institute for Early Education Research (NIEER) for the complete blog post.