Understanding the origins of poor literacy and numeracy skills in adulthood and how to improve them is of major importance when society places a high premium on proficiency in these basic skills. This edited collection brings together the results of recent longitudinal studies that greatly extend our knowledge of what works in raising skill levels, as well as the social and economic returns to improvement. Many fundamental research questions in adult education involve change over time: how adults learn, how program participation influences their acquisition of skills and knowledge, and how...