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Peer reviewedHayes, Donald P.; Wolfer, Loreen T.; Wolfe, Michael F. – American Educational Research Journal, 1996
Contents of 800 elementary, middle, and high school textbooks published from 1919 to 1991 were analyzed with regard to their levels of difficulty. Following World War II, there was a major decline in schoolbook difficulty which may have led to the subsequent decline in SAT-verbal scores. (MAK)
Descriptors: Content Analysis, Difficulty Level, Educational History, Elementary Secondary Education
