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The Flesch Index, developed in 1940 by Dr. Rudolph Flesch, is an indicator of how easy it is to read and understand the text of a book. The score returned is based on a 100 point scale, with 100 being easiest to read. Scores between 90 and 100 are appropriate for 5th and 6th graders, while a college degree is considered necessary to understand text with a score between 0 and 30.


It was further refined to become the Flesch-Kincaid index