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a. Illiteracy Illiteracy means the inability to read or write (in any language). We find a person illiterate if the person cannot read or write a simple message (in any language) even though the person can sign his or her name. An illiterate person generally has little or no formal schooling.

We consider an individual illiterate if he or she cannot read or write a simple message, such as instructions or inventory lists, even though the individual can sign his or her name. We will assign an individual to the illiteracy category only if the individual is unable to read or write a simple message in any language.