To cover all the material to which the title of this book alludes one would expect a multiple-volume series; after all, individual development is a complex, multidetermined, and integrated process that takes place progressively from conception to death. Influential factors occur both within the individual (biological, mental, behavioral) and in the environment (social, physical), and their interaction requires a systems approach that integrates the role of experience, learning, genetic predispositions, and unique vulnerabilities on the changing character of individuals through the life cycle. In just over 500 pages, however, the various authors who participated in the Nobel symposium presented in Stockholm in June 1994 whose manuscripts generated this book provide a comprehensive overview using cross-disciplinary research to better understand the developmental process of individuals. Their goal was to move toward an integrated science of human development. Their model was that complex processing cannot be understood or explained by the study of single variables considered separately out of context from other factors that operate simultaneously. Their strategy was to integrate contributions from a number of traditional scientific disciplines, including developmental biology, developmental psychology, physiology, neuropsychology, social psychology, sociology, anthropology, and other related disciplines.