simulation statistical (and probability) theory plays a part both in relation to the input data and in relation to the results that the simulation produces. For example in a simulation of the flow of people through supermarket checkouts input data like the amount of shopping people have collected is represented by a statistical (probability) distribution and results relating to factors such as customer waiting times, queue lengths, etc are also represented by probability distributions. In our simple example above we also made use of a statistical distribution - the uniform distribution.