1 Fry’s Readability Graph (right) is one of many readability formulas. Other popular measures include Flesch Formula, Dale-Chall formula, Farr-Jenkins-Paterson formula, Kincaid Formula, Gunning Fog Index, and Linsear Write Index.
2 “Use [readability formulas] as a guide after you have written, but not as a pattern before you write. Good writing must be alive; don’t kill it with systems.” The Technique of Clear Writing by Robert Gunning, McGraw-Hill, 1968.
3 For additional writing guidelines, see The Elements of Style by William Strunk Jr. and E. B. White, Allyn & Bacon; 4th edition, 2000.
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