This article summarizes results from studies of the organization and development of cognitive abilities in adults aged 20 to 60 years old. Theories of intelligence stipulating a hierarchy of intellectual functions, with fluid and crystallized intelligence at the top, are supported. Six conclusions on age differences are offered. (Author/RD)

Intended for adult educators, this book is a comprehensive overview and synthesis of what is known about adult learning. Part 1 describes the context of learning. Chapters 1-4 describe the following: the sociocultural context; the range of settings and ways they influence learners and the learning process; literature on who participates in formal…