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Although PISA states that it does not test school knowledge, the PISA results are interpreted as valid measures of the quality of national schools systems ...

„Although PISA states that it does not test school knowledge, and that it does not test according to national curricula or testing school knowledge, the PISA results are interpreted, also in OECD reports, as valid measures of the quality of national schools systems.“

Univ.-Prof. Dr. Svein Sjoeberg, „PISA: Politics, fundamental problems and intriguing results“ (2012), S. 3