What are Lexile® levels?
Lexile levels used in Read Theory are measures of text complexity. We contract with MetaMetrics®, the inventors of the Lexile® framework, to compute the Lexile® levels for each passage. There is a range of acceptable Lexile® levels that can be appropriate for students in each grade level. For our mapping of Lexile® levels onto grade levels, we follow a mix of the 25th to 75th percentile scores from the Text Demand Study 2009 and the 2012 CCSS Text Measures. There is some overlap between the grade levels on this scale.
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