The goal of this research project was to create a guide on the effective use of assessment instruments and methodologies, related resources, and guidelines for measuring adult learners' attainment of basic skills and competencies to document educational gains and demonstrate program quality. The project focused on confirming current use of assessment in adult basic and literacy education (ABLE) programs and conducting focus groups to determine perceived barriers to using standardized assessments. Ongoing consultation with COSMOS Corporation (the project contractor) confirmed ABLE programs' current use of assessment instruments and methodologies. The project team conducted a literature review to develop supplemental information on recently published, commercially available assessments and on current assessment practices. This research also included conducting focus groups with ABLE practitioners to identify concerns and issues relating to assessment practices. Based on the research, project staff developed a basic guide to the effective use of standardized and informal assessments. (Focus group questions are appended.) (YLB)