This study examined the McCall-Crabbs Standard Test Lessons in Reading to determine whether selections of passages covered a sufficiently wide range of difficulty to warrant their use in developing readability formulas. The results, which find several readability formulas suspect, are discussed. (Author/MT)

Noting that four of the six most common readability formulas use the McCall-Crabbs Standard Test Lessons in Reading as the independent criterion of difficulty to establish validity, while the other two often site their correlation with the first four to determine validity, a study examined whether these lessons consisted of passage selections…

Four readability formulas were analyzed to determine the reading grade equivalence of instructional materials at the middle grades and above: the Dale-Chall formula, the Gunning-Fog Index, the Flesch Reading Ease Formula, and the McLaughlin SMOG Grading. In addition, Spache and Wheeler/Smith formulas were analyzed for evaluating primary grade…