We’ve talked a lot about PISA on this show. Today we take a fresh look at the test, digging into the specifics about how the test is created and what the results can tell policy makers and teachers.

My guest today is Sam Sellar, a reader in Education Studies at Manchester Metropolitan University and a Director of the Laboratory of International Assessment Studies. He has recently co-written with Greg Thompson and David Rutkowski a short book on PISA titled, The Global Education Race: Taking the measure of PISA and international assessment.