Advantages and disadvantages of simulation

Disadvantages of simulation

n   Model building requires training, it is like an art.

n   Compare model building with programming.

n   Simulation results can be difficult to interpret

n   Most outputs are essentially random variables

n   Thus, not simple to decide whether output is randomness or system

n   behavior

n   Simulation can be time consuming and expensive

n   Skimping in time and resources could lead to useless/wrong results



The disadvantages are offset as follows

n   Simulation packages contain models that only need input data

n   Simulation packages contain output-analysis capabilities

n   Sophistication in computer technology improves simulation times

n   For most of the real-world problems there are no closed form solutions

                                 When simulation is not appropriate

n   Simulation should not be used, in the case

n   when problem is solvable by common sense

n   when the problem can be solved mathematically

n   when direct experiments are easier

n   when the simulation costs exceed the savings

n   when the simulation requires time, which is not available

n   when no (input) data is available, but simulations need data

n   when the simulation cannot be verified or validated

n   when the system behavior is too complex or unknown



Example: human behavior is extremely complex to model

                                  Application areas of simulation

n   Manufacturing applications

n   Construction engineering and project management

n   Military applications

n   Logistics, supply chain and distribution applications

n   Transportation models and traffic

n   Business process simulation

n   Health care

n   Call-center

n   Computers and Networks

n   Games







                                    Náklady simulace X přesnost

                     Aplikace simulace při (strategickém) rozhodování manažerů

                     Příklady výsledků optimalizace call centra pomocí simulace

Ve špičce zodpoví skupina agentů 200 hovorů za 1 hodinu a průměrná délka hovoru jsou 3 min. Pro 90%
hovorů pak platí:

npři 12 agentech – hovory zodpovězeny do 120 sekund čekání

nPři 14 agentech – do 25 sec.

nPři 15 agentech – do 15 sec.

nDalší zvyšování počtu agentů nezlepší podstatně kvalitu obsluhy (dobu čekání)



nPři 12 agentech – stráví agenti zodpovídáním hovorů 83% času

nPři 15 agentech – 66% času

















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