The U.S. Department of Education's National Center for Education Statistics has updated the household and prison public-use data files for the 2003 National Assessment of Adult Literacy and the 1992 National Adult Literacy Survey. The accompanying 2003 National Assessment of Adult Literacy Public-Use Data File User's Guide explains how the data was collected and how it can be analyzed and includes codebooks for the datasets as well as instructions for using AM Software to analyze the data. The data derive from one-on-one interviews with adults in homes and prisons across the United States. Household interviews were conducted in 2003 and prison interviews were conducted in 2004. The household sample was multi-stage and selected on the basis of Census-defined geographical areas, while the prison sample was institution-based. The following are appended: (1) 2003 Household Background Questionnaire; (2) 2003 Prison Background Questionnaire; (3) Derived Variables; (4) Instructions on Using AM Software to Analyze the 2003 NAAL Data; (5) Electronic Codebook for Windows User's Manual; (6) 2003 NAAL Household Survey Data File Contents in Position Order; (7) 2003 NAAL Prison Survey Data File Contents in Position Order; (8) 1992 NALS Household Survey Data File Contents in Position Order; (9) 1992 NALS Prison Survey Data File Contents in Position Order; (10) 2003 Household Data File Codebook; (11) 2003 Prison Data File Codebook; (12) 1992 Household Data File Codebook; and (13) 1992 Prison Data File Codebook.