GOR - The German Society of Operations Research - and its members provide numerous significant contributions to Operations Research/Management Science, with respect to both theory and practice. In order to demonstrate the high standards of these contributions and to make them more easily available, in particular to researchers and practitioners from outside the German-speaking countries, GOR has created this book series. It publishes high-quality monographs and collections of papers on all aspects of Operations Research/Management Science, which deal with a single topic of current interest and originate from or are related to the activities of GOR.