Under the No Child Left Behind Act, districts that have failed to demonstrate adequate yearly progress for two years in a row must pay for low-income students' private-sector tutoring. As No Child Left Behind enters its fifth year, a report by the Washington, DC, nonprofit Center on Education Policy found that of about 300 districts surveyed, 10 percent had to offer students tutoring in 2004-2005. Yet many officials were not sure whether the extra help was effective, and 35 percent of states had no system to track tutors' quality. In this article, the author reports the outcomes of this program.