Simulation

Simulation is the imitation of the operation of a real-world process or system over time. The act of simulating something first requires that a model be developed; this model represents the key characteristics or behaviors of the selected physical or abstract system or process. The model represents the system itself, whereas the simulation represents the operation of the system over time.

Advantage:

Main advantages of simulation include:

• Study the behavior of a system without building it.
• Results are accurate in general, compared to analytical model.
• Help to find un -expected phenomenon, behavior of the system.
• Easy to perform ``What-If'' analysis. 

Disadvantage:

Main disadvantages of simulation include:

• Expensive to build a simulation model.
• Expensive to conduct simulation.
• Sometimes it is difficult to interpret the simulation results.