The focus on human capital as a driver of economic growth for developing countries has led to undue attention on school attainment.Developing countries have made considerable progress in closing the gap with developed countries in terms of school attainment，but recent research has underscored the importance of cognitive skills for economic growth.This result shifts attention to issues of school quality and，in that area developing countries have been much less successful in closing the gaps with developed countries.Without improving school quality，developing countries will find it difficult to improve their long run economic performance.