In the mid-seventies, the US Navy were looking for a way of measuring the difficulty of technical manuals used by Navy personnel in training. A challenge in using the Flesch Reading Ease measure is that test results are not immediately meaningful.

To make sense of the score requires the aid of a conversion table. So, the Flesch Reading Ease test was revisited and, along with other readability tests, the formula was amended to be more suitable for use in the navy. The new calculation was the Flesch-Kincaid Grade Level (1975).

For more information, please read our blog: The Flesch Reading Ease and Flesch-Kincaid Grade Level.
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