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The Lexile Framework® for Reading

Lexile Measures are available across selected articles in World Book Kids, World Book Student, World Book Advanced, Discover and Public Library Edition, as well as Early World of Learning. The selection process for articles was based on the most-accessed articles for each product.

The Lexile Framework® for Reading is a system that can help determine the reading level of any written material measuring Semantic Difficulty (the difficulty of the vocabulary) and Syntactic Complexity (the complexity of the sentences).

There are two Lexile measures: the Lexile reader measure and the Lexile text measure.

Lexile Reader Measure
A score assigned to a student based on a reading test or programme. Higher Lexile measures indicate a higher level of reading ability.

Lexile Text Measure
A Lexile text measure is a measurement of the difficulty of a book, article, or piece of text based on word frequency and sentence length. A Lexile text measure is usually shown as a number with an “L” after it — 510L is 510 Lexile. Exceptions to this format are the measures BR (Beginning Reader—a Lexile score of zero or below) and NP (non-prose).

How Lexile Scores Are Used
Lexile scores help match students to texts within their targeted reading level by predicting how well students are likely to understand reading material. Teachers often use Lexile measures to customise instruction to individual students. Librarians use Lexile measures to connect readers with books they can read and help teachers and parents to select reading materials for young learners.

A very useful feature of Lexile reader and text measures is that they can be used together to predict how well a reader will likely comprehend a text at a specific Lexile level. 

The image below shows the relationship between the Lexile reader measure and the Lexile text measure on the Lexile scale.

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