This model contains five constants that we can vary to examine their effect on simulation output. We will assume that we know the exact values for two constants: price of item and revenue to sales (because these are policy decisions that managers can readily set). The uncertain parameters are sales force productivity, sales force adjustment time, and sales person salary. We will select these parameters and assign maximum and minimum values along with a random distribution over which to vary them to see their impact on model behavior. Note that we could select only one parameter if we wanted to see how sensitive model behavior is to one parameter.
NOTE Parameter is a synonym for Constant. In the Vensim documentation parameter is frequently used to refer to model Constants that we select for variation during sensitivity analysis and optimization.
