Turning deterministic model into one that includes uncertainty à Simulation model.Example: Overbooking a flightAim: To find the number of extra reservations to avoid both empty seats and bumped flyersApproach: Use models that use historical data, mix of refundable and non-refundable tickets, location, different airfare classes and levels. There are 2 uncertainties added to this model:1 Demand​2 No show-up rate