1) Model may not be the best solution.
2) Most of the situation model requires a higher budget and also consumes a lot of time to create.
3) The results of the simulation studied can’t be applied to solve the other problems irrelevant because the simulation model to collect only the factors associated with the problem and the other factors unrelated to the simulation will not be calculated to result.
4) Software used for modeling situations is complicated and difficult to analysis so, the user must have specific knowledge of the modeling scenarios.