The 1988 AAPM Summer School explored the modern world of computers, with special emphasis on applications in medical physics. Authors of the articles in this book, who were also presenters at the Summer School, were asked to assume that the attendee reader was familiar with computers in general but was not a computer scientist or a hacker. The manuscripts were reviewed by at least two experts prior to inclusion in this book. Since not all presenters submitted manuscripts, this volume is not a proceeding in the traditional sense.