Increasingly, applications require computers to interface with the real world and draw data directly from it. These applications range from defense to medicine, manufacturing to environmental health. They all depend on inputs that are noisy, incomplete, and of limited accuracy. This book introduces multi-sensor fusion, which has emerged as the method of choice for implementing robust systems that can handle imperfect inputs. It represents the first broad, practical text on the subject - covering all the technologies and methods associated with multi-sensor fusion, including multidimensional data structures; techniques for reasoning with uncertainty; approaches to enhancing system dependability; and working with meta-heuristics.