Pisa data may be incomparable, Schleicher admits
Helen Ward,
tes,
Mar 27, 2017
A change in the way the 2015 PISA tests were administered may have resulted in changes in the outcome. "It remains possible that a particular group of students – such as students scoring [high marks] in mathematics on paper in Korea and Hong Kong – found it more difficult than [students with the same marks] in the remaining countries to perform at the same level on the computer-delivered tasks."
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