Teachers are the most important factor in whether a student achieves in the classroom, so closing the achievement gap means improving the effectiveness of our teachers and their principals. But right now, no one really knows how effective our teachers are. The Obama administration recognizes that many states' evaluation systems are broken, and the…

The educational achievement and attainment of young people in the United States has been a long-standing issue of concern. While analyses of long-term trend data from the National Assessment of Educational Progress (NAEP) show that students in the United States have made gains in reading and mathematics over the past few decades, a sizeable…