Malcolm Shepherd Knowles was a key writer and theorist in the field of adult education in the United States. He died in 1997 and left a large legacy of books and journal articles behind. This book examines Knowles’ principal works, graphically depicts his framework in a series of diagrammatic representations, identifies the major elements of thought and plots the emergence of new ideas in the sequence in which they occurred. It constructs an overall narrative history of the development of thinking in Knowles’ writings, indicates the major phases through which that thinking passed and identifies the writings that belong within each phase.