Science -- Mervis 304 (5677): 1583

Science -- Mervis 304 (5677): 1583 Meager Evaluations Make It Hard to Find Out What Works:

"The Education Department even funds a 'What Works Clearinghouse' on programs ranging from teaching math to reducing schoolyard violence. This heightened interest in assessment stems from the massive 2001 education reform bill--known as the No Child Left Behind Act--which requires school districts to offer programs shown to be effective through 'scientifically based research.' But there's a dirty little secret behind that requirement: No program has yet met that rigorous standard, because none has been scientifically evaluated and shown to be effective. (A related secret is that there's no consensus on the type of evaluation studies that are needed.)"