But graduation rates, while important, speak little to the quality of education received. The OECD’s Programme for International Student Assessment (PISA) reviews the extent to which students have acquired some of the knowledge and skills that are essential for full participation in modern societies. In 2012, PISA focused on examining students’ reading ability, skills in maths and level in sciences, as research shows that these skills are more reliable predictors of economic and social well-being than the number of years spent in school.