This paper summarizes the work to date on the revised Harris-Jacobson Readability Formulas. The contents include "The Criterion," which discusses the criterion used in the development of the formulas; "Variables Employed," which includes percent of uncommon words, average sentence length, percent of long words, mean number of letters per word, and…

There is a need for basic readability research and for an easily applied and accurate new readability formula. Two steps taken toward the development of such a formula are the revision of a vocabulary list for primary grades and the combination of reading exercises given at different grade levels into a single scale of ascending difficulty. Much…