The baffling and fascinating problem of the mind is a natural subject for Jean Piaget, the eminent Swiss psychologist. The origins, nature, methods, and limits of human knowing are an outgrowth of his long preoccupation with genetic origins and environmental development of logical thought in children. Piaget has lucidly and brilliantly broken new ground and laid down the scientific basis for an entirely new epistemology. In this provocative and seminal contribution to human psychology, he has discarded the assumptions of traditional epistemologies and sets for that knowledge is not an accomplishment but a process; what is learned is not learned for all time but changes and grows with the learner. --