The author wishes to thank Christopher Chapman, Valena Plisko, Marilyn Seastrom, Duc-Le To, Lisa Hudson, and Tracy Hunt-White at the U.S. Department of Education and Matthew DeBell at the American Institutes for Research for their technical reviews and helpful suggestions. Mary Hagedorn, Priscilla Carver, Iheoma Iruka, and Soumya Alva at Westat also provided input and suggestions in the preparation of this report. Finally, the author wishes to thank the many adults who responded to the Adult Education Survey of the 2005 National Household Education Surveys Program for their responses on which the report is based.