Lexile

Key takeaways

Lexile belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Lexile to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Lexile from memory before moving on to harder problems.

Reference excerpt

The Lexile Framework for Reading is an educational tool in the United States that uses a measure called a Lexile to match readers with reading resources such as books and articles. Readers and texts are assigned a Lexile score, where lower scores reflect easier readability for texts and lower reading ability for readers. Lexile scores are assigned based on individual words and sentence length, rather than qualitative analysis of the content. Thus, Lexile scores do not reflect multiple levels of textual meaning or the maturity of the content. The United States Common Core State Standards recommend the use of alternative, qualitative methods to select books for grade 6 and above. In the U.S., Lexile measures are reported annually from reading programs and assessments. According to LightSail Education, about half of U.S. students in grades 3-12 receive a Lexile measure each year. The Georgia Department of Education provides resources for using Lexile measures.

Components of the Lexile framework The Lexile Framework is made up of Lexile reader measures and Lexile text measures, both of which are put on the Lexile scale.

Lexile scale The Lexile scale runs from BR300 (Lexile) to above 2000L, though there is not an explicit bottom or top to the scale. Scores 0L and below are reported as BR (Beginning Reader). These books or students may be coded as Lexile: BR. In some cases, a student will receive a BR code followed by a number (e.g. Lexile: BR150L). A measure of BR150L indicates that the Lexile measure is 150 units below 0L.

Lexile measure

A Lexile measure is defined as "the numeric representation of an individual's reading ability or a text's readability (or difficulty), followed by an 'L' (Lexile)". There are two types of Lexile measures: Lexile reader measures and Lexile text measures. Reader measures are assigned to individuals based on their reading comprehension for a piece of text. Text measures are assigned to a piece of text based on the text's vocabulary and syntax. According to MetaMetrics, text measures are evaluated through the "Lexile Analyzer", a computer program that assigns a score based on vocabulary and syntax. MetaMetrics states that over 150 publishers, including Capstone Publishers, Discovery Ed, Houghton Mifflin Harcourt, McGraw-Hill, Pearson PLC, Riverside Publishing, Scholastic Corporation, Simon & Schuster, Workman Publishing Company, and World Book, offer certified Lexile text measures for their materials. According to MetaMetrics, Lexile text measures can assist in selecting appropriately challenging materials for readers.

Lexile codes Some books receive Lexile codes—two-letter designations that appear before the Lexile measure—to provide additional context about developmental appropriateness, reading difficulty, and intended use. BR is the only code that applies to both readers and text.

History The Lexile framework was created in 1989 by MetaMetrics. From 1984 to 1996, MetaMetrics received funding through five grants from Small Business Innovation Research, obtained through the National Institutes of Health, to develop a measurement system for reading and writing. The measurement ideas embedded in the Lexile framework can be found in two 1982–83 articles by Stenner and Smith.

Independent evaluations In Mesmer's Tools for Matching Readers to Texts: Research Based Practices, a 2006 study by Walpole et al. is described, in which 47 second-graders were assigned texts based on their Lexile scores. The study found that the students could read texts at their assigned Lexile scores (93%), but also noted that 43% of the sampled books were below a basic standard for 2nd grade. Mesmer concludes that "Lexile scores and book levels may not help teachers in finding books that can be read fluently" and lists the cost of using the Lexile inventory tools as a disadvantage. In 2001, the National Center for Educational Statistics (NCES) published a review of Lexile measures, concluding that the framework is an improvement over traditional reading measures, while also noting the omission of factors such as reader motivation, interest, and knowledge. The review affirmed the value of sentence length and word frequency as measures of complexity but also stated that these metrics are an estimated correlate of readability. The NCES concluded that while other work on text metrics may be more useful, Lexile scores are easier to analyze. In 2001, Stephen Krashen published an article arguing that the Lexile Framework was potentially harmful in limiting students' reading choices and that the resources spent on it might be better spent on books. In a paper titled "Interpreting Lexiles in Online Contexts and with Informational Texts", Elfrieda H. Hiebert concluded that the variability of Lexile scores within the same text can be extensive and that slight changes in punctuation can result in "significant reclassification" on the Lexile scale.

Common core standards U.S. Common Core State Standards for English Language Arts states that Lexile scores can be used to help determine text complexity levels for students. The standards also note that quantitative methods like Lexile may underestimate the challenges of complex narrative fiction and that qualitative measures should be prioritized for students in grade 6 and above.

Examples of books with Lexile measures

More examples are available here.

Use Lexile measures are reported by various reading assessments and programs.

Reading assessments that report Lexile measures Source: State assessments

… excerpt ends here. Continue reading the full article.

Illustrations

Worked examples

Example 1 — a first encounter with Lexile

Start with the simplest possible case. Write down what Lexile claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Lexile before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Lexile ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Lexile

In research: Lexile appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Lexile in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Lexile is common in secondary-school and first-year university syllabi. It links to neighbouring topics Readability, so understanding it makes those chapters shorter.
In everyday life: Look for Lexile outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

How to study Lexile in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Lexile means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Lexile out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Lexile in simple terms?

The Lexile Framework for Reading is an educational tool in the United States that uses a measure called a Lexile to match readers with reading resources such as books and articles. Readers and texts are assigned a Lexile score, where lower scores reflect easier readability for texts and lower readi…

Why does Lexile matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Lexile?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Lexile.