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Flesch–Kincaid readability tests
The Flesch–Kincaid readability tests are readability tests designed to indicate how difficult a reading passage in English is to understand. There are two tests, the Flesch reading ease, and the Flesch–Kincaid grade level. Although they use the same core measures (word length and sentence length), they have different weighting factors. The results of the two tests correlate approximately inversely: a text with a comparatively high score on the Reading Ease test should have a lower score on the grade-level test. Rudolf Flesch devised both systems, while J. Peter Kincaid developed the latter for the United States Navy.
==History==
"The Flesch–Kincaid" (F–K) reading grade level was developed under contract to the US Navy in 1975 by J. Peter Kincaid and his team.〔Kincaid, J.P., Fishburne, R.P., Rogers, R.L., & Chissom, B.S. (1975). Derivation of new readability formulas (automated readability index, fog count, and flesch reading ease formula) for Navy enlisted personnel. Research Branch Report 8–75. Chief of Naval Technical Training: Naval Air Station Memphis.〕 Related UN Navy research directed by Kincaid delved into high-tech education (for example, the electronic authoring and delivery of technical information); usefulness of the Flesch–Kincaid readability formula; computer aids for editing tests; illustrated formats to teach procedures; and the Computer Readability Editing System (CRES).〔 (also reported in Aviation Week and Space Technology, January 11, 1982, pp. 106–107.)〕
The F–K formula was first used by the Army for assessing the difficulty of technical manuals in 1978 and soon after became the Department of Defense military standard. Pennsylvania was the first US state to require that automobile insurance policies be written at no higher than a ninth-grade level (14–15 years of age) of reading difficulty, as measured by the F–K formula. This is now a common requirement in many other states and for other legal documents such as insurance policies.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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