Simulation is a modeling and analysis technique used to evaluate and refine dynamic systems of all kinds. It developed from a relatively obscure technology used only by a few specialists to become a largely used tool by decision makers in the various levels of the companies.
Imagine yourself working in a highly competitive company, managing a manufacture or services division which is impregnated with out of date technologies and inefficient managing practices.
You know that in order to remain competitive, the company must change, but you are not sure of which changes would be better or of which changes would work.
You wish you could try some different alternatives,but knows that this would take a long time, a lot of money and that it would cause problems and interruptions in your present operations. Suppose now that there is magic manner of making a reproduction of your system, providing an unlimited freedom of rearranging activities, redistributing resources or changing any procedure in your present operation.
And if you could experiment completely new technologies and radical innovations-all this in a matter of minutes or hours? Suppose that all this experiment could be done in compact time, with automatic monitoring and reports of the main performance indicators. You would not find ways to improve your operations,but you would have done it without risks,without compromising any investment, without losing time and without stops in your present system. Well, this is precisely the power provided by simulation. It allows you to experiment a model of your system in your computer in a short period of time, offering a capacity of decision making that is impossible through any other technology.
Extracted from the book "Simulation Using Promodel" (2000 ed,foreword, page V),from Harrel, Ghosh and Bowden, published by McGraw-Hill Higher Education - ISBN 0-07-234144-0.