To serve adults with disabilities without a high school diploma, the federal government and states have funded adult education and literacy programs that provide services to accommodate the needs of those adults. In addition, the Tests of General Educational Development (GED Tests) provide adults with disabilities with testing accommodations to minimize the impact of examinee characteristics on the assessment of academic knowledge and skills. Using data from the 2003 National Assessment of Adult Literacy (NAAL), this study examined the literacy level across GED credential recipients, high school graduates, and non-high school graduates. The study also provided evidence of the validity of the GED credential as an indication that adults with disabilities with a GED credential have achieved the literacy skills and knowledge equivalent to those skills and knowledge demonstrated by adults with disabilities with a high school diploma. (Contains 8 figures and 5 tables.)