Without Data, You Are Just Another Person with an Opinion

The July/August issue of The Atlantic magazine featured a fascinating article on German scientist and education analyst Andreas Schleicher (“The World’s Schoolmaster”).  Schleicher was a leader in creating the PISA assessment, a survey given every three years to a sample of 15-year-olds in every country in the Organization for Economic Co-operation and Development (OECD). First…

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