Modelling is the process of producing a model; a model is a representation of the construction and working of some system of interest. A simulation of a system is the operation of a model of the system. Teacher can use modelling and simulation as a medium of teaching and learning in classroom. But the most important thing that teacher has to remember is the computer simulations is just a supplement to teaching processes not to replace it. Computer simulations make teaching processes become more interactive, authentic and meaningful. Learners can observe, explore, recreate, and receive immediate feedback about real objects, phenomena, and processes that would otherwise be too complex, time-consuming, or dangerous. The example of the software that teacher can use as a simulation tool is STELLA software.
