This is a critical review of methodological issues in the evaluation of adult literacy education programs in the United States. It addresses the key research questions: What are the appropriate methods for evaluating these programs under given circumstances. It identifies 15 evaluation studies that are representative of a range of adult literacy contexts at various evaluation levels; and reviews each study regarding evaluation designs, data sources, learner assessment tools, and indicators of program effectiveness. It summarizes methodological lessons learned regardi toolsng the evaluation of adult literacy education and identifies areas for further research. (Contains 2 tables.)