Questions posed by the Pisa international school tests

In both your news report (UK schools failing to climb global league table, December 7) and your editorial (Slicing up the Pisa results) you make the mistake, common throughout the media and across many commentators, of assuming that the results from the OECD Programme for International Student Assessment, tell us anything useful about the relative performance of different educational systems. Each of the 70 or so countries taking part in Pisa has a unique educational curriculum, structure and method of delivery, that reflect tradition, politics and social norms, and it makes…

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