Hi, I am building this model where I want to test several combinations of part arrivals for example interarrival time between parts is 100-500sec, 200-300sec etc. I do not want to do this manually and somehow define all the combinations of arrivals and the model runs all combinations individually and provides me with the results for each combination, i.e. the output from the last processor. I am not sure if using 'Parameters' is the way to get this working. See the simple model.