A lift traffic design is carried out to determine the rated load, rated speed, number of lifts and number of other defining parameters of a lift installation, in order to meet the passenger demands made upon it. A calculation can be carried out using verifiable, transparent, reproducible and repeatable mathematical (statistical) theory. Should further information be required then a simulation is often carried out, but what is the veracity of the simulation results? This paper reviews the simulation results for the same project brief. The paper considers whether simulation results can be verifiable, transparent, reproducible and repeatable.