Once a representative run or collection of runs of the traffic simulation has been obtained, it can be analyzed. For example, one can see where congestion will show up, and which people get stuck in it. Analysis is the other aspect of the system that influences the decision about the level of realism in the modules. For example, if one is interested in emissions, one needs a micro-simulation of the driving behavior with enough information on, e.g., acceleration in order to derive the necessary quantities. Or if one is interested in the possible rescheduling of activities as a consequence of transportation infrastructure changes, one needs to model the effect of ``trip chaining'', i.e. the fact that people can for example go shopping on the way back from work, but they could also put in a stop at home before they go shopping.