Simulation systems are easier, cheaper, and safer to use than real systems, and often the only way to build the real systems. For example, learning to fly a fighter plane using a simulator is much safer and less expensive than learning on a real fighter plane. System simulation mimics the operation of a real system such as the operation in a bank, or the running of the assembly line in a factory etc.
Simulation in the early stage of design cycle is important because the cost of mistakes increases dramatically later in the product life cycle. Also, simulation software can analyze the operation of a real system without the involvement of an expert, i.e. it can also be analyzed with a non-expert like a manager.
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