Modelling is a key activity in science and engineering. If one has a closer look then nearly all activities are in one or the other way associated with models and the activity of constructing models.
Any computational engineering activity makes use of models. Models are case based, depend strongly on the application. Since the application is utilising the model, the performance measure associated with the application is the ultimate measure for the quality of the model and thus modelling becomes an iterative operation, whereby each step consists of:
model – application – performance evaluation – adaptation of the model