A Practical Note on Readability Formulas.
Walter Pauk · 1969
At this point, this question may well be asked: What are the advantages of these new formulas over the old ones? The answer is that the new ones have two advantages: ease of calculation and a saving of time; that is, the entire calculation takes about ten minutes when using McLaughlin's formula, and about fifteen minutes using Fry's formula. This is in contrast to forty minutes when using an older formula, say the Dale-Chall.