This international publication is a premiere in the emerging field of lifelong learning. It offers the first systematic attempt to provide reliable empirical information on some critical issues regarding the transformation of adult and continuing education is post-industrial societies such as: What is the extent of the learning demand among the adult population in industrialized countries? How many adults are involved every year in organized learning activities for vocational reasons, for reasons of academic or general education, and for socio-cultural aims? Who participates in what kind of activities? Who does not participate, and why? How is the transformation of the learning demand to be explained? What are the main factors at work in this remarkable rise of the learning aspiration of adult women and men? Why is it important to monitor the expanding field of organized adult learning? And how is its dispersed reality of multifold provision to be monitored? This publication is aimed at decision-makers in the domain of education and human-resource-development policies, at researchers in the fields of work, education, and culture, at practitioners in adult and continuing education, and at a general public increasingly interested in lifelong learning.