Readability formulas were originally conceived of as being evaluative measures. However, if a text is being rewritten or revised so that it matches a particular level of ability in its intended readers, it is rather inescapable that readability formulas will influence the changes made. Tacitly or not, formulas now are used to diagnose what causes…

Argues against the implicit use of readability formulas as guides to writing graded texts and urges experimental research to define the real factors constituting readability. (AEA)

In the past 30 or 40 years there has been much discussion about what factors contribute to readability in texts. In an attempt to characterize factors not measurable by current objective readability formulas, four texts that were adapted for younger readers were compared with their originals to see what kinds of changes adaptors had made and to…