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Never judge a book by its cover—use student achievement instead

“if all schools could be persuaded to switch to one of the top quartile textbooks, student achievement would rise overall by roughly 0.127 studentlevel standard deviations or an average of 3.6 percentile points”


https://www.brookings.edu/research/never-judge-a-book-by-its-cover-use-student-achievement-instead/