You’re no doubt hearing a lot about education these days, with the release of the latest results from PISA. Over the two decades of its existence, the OECD Programme for International Student Assessment has convened a growing number of countries – now around 80 – to participate in its triennial assessment of what 15-year-old students know and can do. But PISA has also attracted some criticism along the way. Yong Zhao, professor in the School of Education at the University of Kansas, and Aaron Benavot, professor of Global Education Policy in the School of Education at the State University of New York at Albany, discuss the value of a test the whole world can take with Director of the OECD Directorate for Education and Skills, Andreas Schleicher.