The ProblemWith large and complex simulation studies one of the most crucial success factors is the way you model reality, followed by choosing the right level of abstraction. Designing a modeling approach in these studies is therefore as important as building the actual model itself.The following paper describes a methodology, using template technology, which already has been successfully employed in large and complex simulation studies. This paper uses a rail capacity study as a vehicle to present the methodology as used in a commercial project.

Business processes are increasingly recognised as the key to competitive survival. The important opportunities inherent to this invisible economic asset are the foundations of process centred management.Simulation of business processes creates added value in understanding, analysing, and designing processes by introducing dynamic aspects. It provides decision support by anticipation of future changes in process design and improves understanding of processes.