Book excerpt: The industrial nations of the world have become Information Societies. Advanced technologies have created a communication revolution, and the individual, through the advent of computers, has become an active participant in this process. The "human" aspect, therefore, is as important as technologically advanced media systems in understanding communication technology. The flagship book in the Series in Communication Technology & Society, Communication Technology introduces the history and uses of the new technologies and examines basic issues posed by interactive media in areas that affect intellectual, organization, and social life. Author and series co-editor Everett M. Rogers defines the field of communication technology with its major implications for researchers, students, and practitioners in an age of ever more advanced information exchange.