A recent study in the USA documented the existence and growth of "excellence gaps" among students. These gaps are similar to the minimum competency achievement gaps that proliferate in policy discussions in many Western countries, but excellence gaps focus on the highest level of achievement rather than minimum competency. We extend this…

Background/Context: The prevailing theory of action underlying No Child Left Behind's high-stakes testing and accountability ratings is that schools and students held accountable to these measures will automatically increase educational output as educators try harder, schools will adopt more effective methods, and students will learn more. In…