"PISA measures academic subjects only, namely maths, reading and science. To be fair PISA have recognised this flaw and are now embarking on a correction process. But is it right to judge education in these subjects only? One need only focus the curriculum heavily on these subjects to do well, which is exactly what many counties do. Dump sport, music, the arts and humanities and you can produce stellar results."
"The problems in the data are extreme as PISA compares apples and oranges. In fact it compares huge watermelons with tiny seeds. PISA is seriously flawed because of the huge differences in demographics, socio-economic ranges and linguistic diversity within the tested nations. "
Läs om Pisas sju skevheter på bloggen Doald Clark - Plan B