In December, we received more bad news about the achievement of American students: Our 15-year-olds made no significant progress in math and reading on PISA, the largest of the international tests. This followed on the heels of a new report from our National Assessment of Educational Progress (NAEP), which showed no real progress in reading or math for fourth or eighth grade students for the past decade, and longer for reading.The routine debate is underway about how bad this news is, but such arguments mostly miss a core lesson: America’s school reform movement has plainly failed. It’s time to face up to this failure and think about new approaches for improving education . Daniel Koretz is one of the leading authorities on testing in the United States. A professor at Harvard University, he has written two important books about testing--its uses and misuses. Read More...'