The Readability(text) command returns one of several measures of Readability of English language text. By default, when called without the method option, Readability computes the SMOG index of text. Several other measures of readability are provided. The following table lists the valid values of the method parameter m.

Each of the readability indices (or other measures) is a statistical test that uses various properties of the text to determine a measure of the level of difficulty of reading the text. Small amounts of text are not suitable for input. It is recommended that you use at least 100 words of text for any of the measures to provide any meaning.