Reading Levels:
Reading levels fall on a numeric scale that closely correspond with expected grade levels reading expectations. A second grader in the fourth month of the school year will, on average, be reading books at level 2.4.
Lexile:
Lexile levels are determined by analyzing the complexity of a text, primarily focusing on word frequency and sentence length, using a proprietary algorithm developed by MetaMetrics
F & P:
Books are grouped into the appropriate level based on the following considerations:
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Word repetition
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Sentence length
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Total word count
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Sentence complexity
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Number of different words
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Inclusion of supportive illustrations
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Amount of high-frequency (or most common) words
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Themes
This system classifies reading levels alphabetically from A to Z, with A corresponding to the earliest readers and Z falling in line with texts at or above an eighth grade level.