A total of 10 basic science series was examined, using the Spache, Dale-Chall, Lorge, and Fry readability formulas as assessment instruments of readability. To obtain a comparative sampling of the readability of each book for each series, the books were divided into three equal parts, and the passage from the middle of each one-third part was…

The validity of the Dale-Chall Readability ratings for sixth-grade science textbooks when compared to an independent criterion of language difficulty expressed in cloze units was examined. The Canadian Lorge-Thorndike IQ Test and the Canadian Test of Basic Skills, Vocabulary and Comprehension subtests, were administered to 366 sixth graders. Mean…

Four readability indices that focus on the ease of comprehension of printed material are applied to industrial education textbooks for senior high school students. Grade reading levels by subject areas for the four indices are presented in tables, charts, and text. Certain conclusions about the readability techniques studied are suggested. (MF)