If a manager works in the IT, Medical and Finance Industry, it can be easy to convince them to use a discrete event simulation (DES) because the application of a simulation is widely used in the aforementioned industries.

1. Using a real system, describe what type of system (Discrete Event Simulation) can analyze.
2. Using a real system, detail the main objectives of the simulation study, i.e., what will it answer?
3. The manager is unsure how a model can replicate variability in their system. Therefore, explain using a real system, how variability can be created.