The book's emphasis is on learning during the years of adulthood and examines present-day practice of adult education for practitioners. This revised edition brings up to date advances in such areas of learning as controversial theory; the effects of environment; sensory processes; intellectual capacities; motivation and attitude; transactional analysis, conditioning (behaviorism); training programs; group development; emotional climate; curriculum; the teacher as learner; and responsibility of the teacher. Although not designed as a textbook, it has been used as a textbook around the world in many translations. (Author/AJ)