This first book dedicated to chance discovery covers the state of the art in the theory and methods and examines typical scenarios. It is an ideal text for researchers working on new techniques and algorithms as well as professionals dealing with real-world applications. The techniques developed combine data mining methods for finding rare but important events with knowledge management, groupware, and social psychology. The reader will find many applications, such as finding information on the Internet, recognizing changes in customer behavior, and detecting the first signs of an imminent earthquake.