Originally published in 1976, the theme of the book is an examination of cognitive and adaptive processes involved in intelligent behavior and a look at how these processes might be related to tested intelligence. The book contains sections on intelligence from the psychometric viewpoint, computer simulations of intelligent behavior, studies of intelligence as social and biological adaptation, and intelligence analyzed in terms of basic cognitive processes. In a number of the chapters the constructs and methods of modern information-processing psychology are used in their analyses of intelligence. As the reader will discover, the divisions of the book do not necessarily represent competing viewpoints, but rather multiple windows on the phenomenon of human intelligence. Today it can be read and enjoyed in its historical context.