Gunning fog index

Readability test for English writing

In linguistics, the Gunning fog index is a readability test for English writing. The index estimates the years of formal education a person needs to understand the text on the first reading. For instance, a fog index of 12 requires the reading level of a United States high school senior. The test was developed in 1952 by Robert Gunning, an American businessman who had been involved in newspaper and textbook publishing.

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