Document Type : Research Paper

Author

Abstract

In This Article,  the concepts  of models and two important  type of Modeling are defined. In order to  illustrate the problem of different attitudes in computer  Simulation,  an apparently  simple  phenomena  is introduced. Implementation of two computer simulation models  based  on different attitudes towards the phenomena leads  us to different  numeric  results.Finally, the cause  and significance  of the difference  has been discussed.