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Dale–Chall readability formula
The Dale–Chall readability formula is a readability test that provides a numeric gauge of the comprehension difficulty that readers come upon when reading a text. It uses a list of words that groups of fourth-grade American students could reliably understand, considering any word not on that list to be difficult.
==History==
The formula was inspired by Rudolf Flesch's Flesch–Kincaid readability test which used word-length to determine how difficult a word was for readers to understand. Edgar Dale and Jeanne Chall instead used a list of 763 words that 80% of fourth-grade students were familiar with, such as "no", "yes", and other such very basic words to determine which words were difficult. The Dale-Chall Readability Formula was originally published in their 1948 article ''A Formula for Predicting Readability'' and updated in 1995 in ''Readability Revisited: The New Dale-Chall Readability Formula'', which expanded the word list to (3,000 familiar words ).
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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