During the mathematical specification of the simulation model there is no need to
bother about the correct parameter values to be used during the Monte Carlo
simulation. Of course, this is addressed prior to running the simulations. In
principle there are three kinds of sources for parameter values. The ideal source
would consist of sufficient statistical data that has been gathered under the various
contextual conditions for which the risk assessment has to be performed. In
practice such ideal sources almost never exist. Instead one typically has to work
with limited statistical data that has been gathered under different conditions.
Fortunately there often are two complementary sources: domain expertise and
scientific expertise (on safety and human factors).