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The grade reading level (or reading difficulty level) is calculated by the average number of sentences (y-axis) and syllables (x-axis) per hundred words. These averages are plotted onto a specific graph; the intersection of the average number of sentences and the average number of syllables determines the reading level of the content.
The formula and graph are often used to provide a common standard by which the readability of documents can be measured. It is sometimes used for regulatory purposes, such as in healthcare, to ensure publications have a level of readability that is understandable and accessible by a wider portion of the population.
- "Readability Formulas: A Necessary Evil?". Reading Horizons. 1987.
- Gunning, T. G. (2003). Building Literacy in the Content Areas. Boston: Allyn & Bacon.
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