Jay Matthews:

A collision of those two views by prominent scholars was inevitable, and in the past several weeks it has hit the education policy world in an explosion of articles, e-mails and public debates, some quite heated. Experts disagree over who is right, and some say the truth may be somewhere in between. But the argument has aggravated a widespread feeling that information on how many children are disappearing from public schools is not nearly as accurate as it should be.