The Lexile measures of texts, such as books and web articles, are determined using the Lexile analyzer. The Lexile analyzer is software that evaluates the semantic and syntactic characteristics of standard English prose to calculate the appropriate Lexile measure.
MetaMetrics produces all official Lexile measures to ensure their quality. Book measures are added to the Lexile titles database, which is accessible online at www.lexile.com/fab and other places. The Lexile titles database is also available for license by partners. If you are interested in licensing the Lexile titles database, or you are a publisher interested in having your materials measured, please send an email to firstname.lastname@example.org for more information.