Tracking students into different classrooms according to their prior academic performance is controversial among both scholars and policymakers. If teachers find it easier to teach a homogeneous group of students, tracking could enhance school effectiveness and raise test scores of both low- and high-ability students. If students benefit from…

The basics of No Child Left Behind (NCLB)--adequate yearly progress benchmarks, provision of supplemental services, and a "highly qualified" teacher in every classroom--are known. The intense scrutiny of the "how to" of those basics has resulted in a mix of impassioned criticism and effusive praise. What has been left largely unexamined in the…

On average, black students typically score one standard deviation below white students on standardized tests--roughly the difference in performance between the average 4th grader and the average 8th grader. Historically, what has come to be known as the black-white test-score gap has emerged before children enter kindergarten and has tended to…