See also books and white papers here at this site regarding illiteracy. Each author creates a definition. [ Click Here ]
In the case of tests performed by Education Testing Services Company in Princeton, they identified five levels of illiteracy and therefore test results were grouped under their five definitions.
Federal government-sponsored testing programs vary in definitions and levels.
See the government book “The State of Literacy in America” compiled by the National Institute for Literacy. Call their hotline to order it (free) at (800) 228-8813.
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