This invaluable resource presents the state of the art in discrete location theory. Among the topics covered are: locations with spatial interactions such as the quadratic assignment problem and competitive locations and games; duality and decomposition methods for facility location problems; the uncapacitated facility location problem; the p-median problem; location of mobile units in a stochastic environment; covering problems; and the p-center problem. Leading experts in the field of discrete location theory contributed to each chapter. In addition, there are numerous exercises, references, notes and further discussions which serve as aids for understanding theoretical and algorithmic concepts.