VEAM and LOGISTICS AND SUPPLY CHAIN MANAGEMENT Workshops VEAM IFIP Working Group 7.6 Workshop on Virtual Environments for Advanced Modelling 4th US-European Workshop on Logistics and Supply Chain Management - An International Research Perspective June 6-9, 2006; Hamburg, Germany Stefan Voß Imke Sassen (Eds.) IWI IWI HAMBURG Institute of Information Systems University of Hamburg In partnership and supported by Deutsche Post World Net International Federation for Information Processing