The first comprehensive study of adult literacy in the US was done in 1992-1993, following the passage of the National Literacy Act of 1991. The Clinton Administration published the detailed results of the study in August 2003, a few months after the study was completed. The results were startling—26% of American adults had no more than basic literacy skills and 22% had little or no literacy ability in the English language.
A follow-up study was done in 2003 to see if adult literacy improved after 10 years.