Computer simulation is widely used to support the design of any kind of complex system and to create computer-generated "virtual worlds" where humans and/or physical devices are embedded (e.g. aircraft flight simulators [20]). However, both the generation of simulation models and the execution of simulations can be time and cost expensive. While there are already several ways to increase the speed of a simulation run, the scientific challenge for the simulation of complex systems still resides in the ability to model (simulate) those systems in a parallel/distributed way [35].