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McCuaig, Susannah M.; Hutchings, Barton – Journal of Reading, 1975
Describes Fry's Readability Graph for determing the variations in difficulty throughout textbooks. (RB)
Descriptors: Evaluation Methods, Measurement Instruments, Readability, Readability Formulas

Hollabaugh, Mark – Journal of College Science Teaching, 1989
Provides step-by-step procedures for developing an index which uses the Gunning Fog technique to evaluate the level of reading difficulty of textbooks. Cites examples, illustrations, and several warnings in the discussion. (RT)
Descriptors: College Science, Content Analysis, Difficulty Level, Evaluation Methods