This collection of essays is dedicated to Professor Klaus Neumann, Head and Chair of the Institute for Economic Theory and Operations Research WiOR at the University of Karlsruhe. On the occasion of his emeritation, disciples, colleagues, scientific companions, and friends coming from dif­ ferent fields have contributed their perspectives on Operations Research to form a broad view on the discipline. The papers are organized in four parts on optimization, OR in production and service management, OR in logistics, and interdisciplinary approaches. We thank all the authors for their participation in publishing this volume. Mrs. Ute Wrasmann from Deutscher Universitats-Verlag deserves credit for her interest and assis­ tance on this project. Finally, we would like to express our gratitude to PTV Planung Transport Verkehr AG in Karlsruhe and to numerous former WiOR colleagues for their financial support. Klaus Neumann was born in Liegnitz (Silesia) in 1937. Prom 1955 to 1961 he studied mathematics at the Technical Universities of Dresden and Munich. His first paper on analog computers and dynamic programming was published less than two years later. In 1964 he obtained a Ph. D. in mathematics under the supervision of Josef Heinhold in Munich. After a two-year stay in industry, he returned to his alma mater, working on the fields of dynamic optimization and control theory.

Dr. Martin Morlock ist Professor am Fachbereich für Wirtschaftswissenschaften der Universität Gießen.
Dr. Christoph Schwindt ist Professor am Institut für Wirtschaftswissenschaft der Technischen Universität Clausthal.
Dr. Norbert Trautmann ist Assistenzprofessor am Departement für Betriebswirtschaftslehre der Universität Bern.
Dr. Jürgen Zimmermann ist Professor am Institut für Wirtschaftswissenschaft der Technischen Universität Clausthal.

Overview of Klaus Neumanns Research.- Overview of Klaus Neumanns Research.- Optimization.- Matrices in Shop Scheduling Problems.- Saddle Points from the Geometric Point of View.- Nachbarschaftssuche bei mehrkriteriellen Flow Shop Problemen.- The Solution of a Generalization of a Bayesian Stopping Problem of MacKinnon.- A Remark on the Formulation of Dual Programs Based on Generalized Convexity.- Operations Research in Production and Service Management.- An Application of Markov Decision Processes to the Seat Inventory Control Problem.- Immaterielle Input-Output-Systeme.- Audit-Staff Scheduling by Column Generation.- An MILP Modelling Approach for Shelf Life Integrated Planning and Scheduling in Scalded Sausage Production.- Optimale Anpassung im Gutenberg-Produktionsmodell: Eine analytische Ermittlung der Kostenfunktion aus den Karush-Kuhn-Tucker-Bedingungen.- Just-in-Time Production of Large Assemblies Using Project Scheduling Models and Methods.- A Cyclic Approach to Large-Scale Short-Term Planning of Multipurpose Batch Plants.- Models and Methods for Workforce Scheduling: An Application to Casino Operations.- Operations Research in Logistics.- Pile Problems and Their Mathematical Treatment.- Risk and Safety Stock Management in Production Planning and Inventory Control with Stochastic Demand and Yield.- Economies of Scale in Hub& Spoke Network Design Models: We Have It All Wrong.- A Stackelberg Equilibrium Model for Supply Chain Inventory Managemen.- Das Potenzial von Operations Research in Transport und Verkehr.- Interdisciplinary Dimensions.- Evolution of Conventions in Populations with Local Interaction Structures.- Empirical Examination of Operational Loss Distributions.- Fuzzy-Nutzwertanalyse und Fuzzy-AHP.- Piecewise Linear Bertrand Oligopoly.