The article examines the available means of determining the readability of written materials and reviews the empirical evidence that indicates consideration of syntactic complexity in determining readability. Problems with readability formulas are pointed out. Guidelines for using readability formulas that take syntactic complexity into account…

In this commentary on Linda Siegel's paper (EC221505), it is argued that a minimum level of general ability is needed for successful reading performance. Above this threshold other kinds of intelligence are required and more important is the contribution of verbal efficiency, which is predicated on the covariance of phonology, morphology, and…