The Lexile® Framework for Reading is a scientific approach to measuring reading ability and the text demand of reading materials. The Lexile Framework includes a Lexile® measure and the Lexile® scale. A Lexile measure represents both the complexity of a text, such as a book or article, and an individual’s reading ability. Lexile measures are expressed as numeric measures followed by an “L” (for example, 850L), and are placed on the Lexile scale. The Lexile scale is a developmental scale for measuring reader ability and text complexity, ranging from below 0L for beginning readers and beginning reader materials to above 2000L for advanced readers and materials. Knowing the Lexile measures of both a reader and a text helps to predict how the text matches the reader’s ability — whether it may be too easy, too difficult or just right.