This book is a collection of invited contributions, each reflec ting an area of medicine in which computing techniques have been successfully applied; but why the title? From a control system point of view the aim of clinical medicine is to recognise the deviation of a patient from the space of normality, and to propel and steer the patient along a trajectory back to that space. Acquiring and main taining the knowledge and skills of this process is the function of medicine. The first chapter expands on this view. Subsequent chapters written by experts in their respective areas cover a fair...