Reading by third grade is a hot topic. Dozens of state legislatures have passed laws aimed at improving early reading, many of them mandating retention if the job is not done by the end of grade 3. Everyone from philanthropists to publishers, from parents to the press, have fixed on it. And setting aside too many people's assumptions to the…

A recent NBER [National Bureau of Economic Research] working paper examines Florida's policy to retain many low-scoring third graders. The report concludes that third-grade retention has immediate positive effects on the following year's test results, but these effects fade over the next six years, with no effect on graduation. The regression…

The No Child Left Behind Act of 2001 requires public schools in the United States to test students in grades 3-8. The author argues that this mandate has been supported by the public, in part, because of the "availability heuristic," a phenomenon which occurs when people assess the probability of an event by the ease with which instances…