Validity, the most critical of readability formula characteristics, requires that a measuring device actually measure what is intended to be measured. To examine validity, a study was conducted in which ten popular handbooks used in the teaching of college freshman composition were examined for comparative validity data--the extent to which scores…

The Flesch reading formula is questioned as being appropriate for evaluating college economics textbooks. The Dale-Chall, Modified Dale-Chall, Fry, and Flesch formulas were used to evaluate nine introductory textbooks. There was little or no consistency in either the absolute reading levels or the rank orderings. (Author/AM)