It is a training method that represents a real life situation with trainees making decisions resulting in outcomes that mirrors what would happen on the job. Simulations enable the trainees to see the impact of their own decisions in an artificial, risk free environment. They are used to teach production and process skills as well as management and interpersonal skills.
Simulators must have elements identical to those found in the work environment. The simulator needs to respond exactly as equipment would under the conditions and response given by the trainees. For this reason, simulators are expensive to develop and need constant updating as new information about the work environment becomes available. Still, they are an excellent training method when the risks of the mistake on the job are great. Trainees do not have to be afraid of the impact of wrong decisions when using the simulator, as they would be with OJT.