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What is Interest Level (IL)?
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Interest Level is based on content – a book’s themes and ideas – and indicates for which age group a book is appropriate. We group content appropriateness into three categories: LY = Lower Years, ages 5-8; MY = Middle Years, ages 9-13; MY+ = Middle Years Plus, ages 12 and above, and UY = Upper Years, ages 14 and above.
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ATOS Book Levels are reported using the ATOS readability formula and represent the difficulty of the text. For example, a book level of 4.5 means the text could likely be read independently by a student whose reading skills are at the level of a typical fourth year student during the fifth month of school. (Of course the content may or may not be appropriate for a fourth year student which is why we also use Interest Levels.).
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In independent literature-based reading, ZPD is the range of books that will challenge a child without causing frustration or loss of motivation. Your child will receive a ZPD range after taking a Star Reading test, or teachers and librarians can use their best professional judgment to determine a ZPD. It’s important for children to read with a high degree of comprehension and within their ZPDs. ZPDs should be adjusted based on the needs of your child. A ZPD range is synonymous with a range of ATOS levels.
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A Lexile measure represents the complexity of a text, such as a book or article. Lexile measures are expressed as numeric measures followed by an “L” (for example, 850L), and are placed on the Lexile scale. The Lexile scale is a developmental scale for measuring reader ability and text complexity, ranging from below 200L for beginning readers and beginning-reader materials to above 1600L for advanced readers and materials.
Values displayed as Lexile® measures that are not followed by an “L” are estimates of Lexile text measures based on a study conducted by MetaMetrics® using ATOS Book Levels and are not certified Lexile measures.
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