The provided text does not contain the complete body of the article, only the title, an introductory excerpt and the author's signature. There is not enough information to create a detailed summary as requested. The available content only mentions that it is an opinion by Susana Peralta on the PISA results, with criticism of what appears to be a tendency of frequent changes in educational policies without adequate testing. To produce a complete and accurate summary, access to the full text of the article would be necessary.
World
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PISA: 20 years backwards and seven concerns for the future
Público11 September 2026 at 00:25
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