Written by emeritus professor A. Michael Noll of the Annenberg School for Communication at the University of Southern California, this book draws on his previous work at Bell Labs and AT&T. Noll distinguishes between "mass" and "interpersonal" media communication, and discusses various media from their inception to the present. Intended for undergraduate students, the author's stated purpose is to "illuminate what is meant by communication media" and "to provide the knowledge, broad perspective, distinction, and methodology necessary to understand communication media - now and in the future." Part ?? is dedicated to analyzing media, and at one point asks if GPS (global positional satellite) technology will evolve to handheld applications: "Will this application diffuse to wireless PDAs and cell phones, using speech both for input and for output of information?" Voice interaction remains unperfected, but if you have never seen a handheld GPS device, ask anyone with an iPhone to show you the application.