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How Lexile leveling works

Lexile measures are based on over 30 years of research and are the most widely adopted measure of reading ability and text difficulty.

Lexile measures help educators and students select books at a level that will challenge them - not so difficult as to be frustrating, but difficult enough to encourage reading growth.

How Lexile leveling measures students
The LitPro Test
This computer-adaptive test measures a student's reading comprehension using authentic passages from fiction and non-fiction texts
The student gets a Lexile measure when he or she completes the LitPro Test
How Lexile leveling measures texts
Objective measure
Lexile text measure
Based on computer analysis of semantic elements of whole prose text
Word frequency
Sentence length
Subjective factors
Teacher/student judgment
Student support, background knowledge or motivation
Theme
Content
Age appropriateness
Student's lexile level
520L
Text Lexile level
560L
Comprehensive way of matching readers to books