The graphics terminal makes it possible for people who are not computer specialists to communicate with computers on an inter­ active basis, without the delay or inconvenience of working constantly through an intermediary. It provides a language of shapes or symbols (full graphics) or words and numbers (alphanumerics) which is understood by both man and machine. The visual output and input facility has considerably widened the applications of computers within the medical world, bringing their enormous powers of data handling and simulation to bear on solving problems in adminis­ tration, patient monitoring and clinical analysis and research. The purpose of this book is to provide examples