I just made the Presiach model to work. Interesting fact about this model is its consistency in definitions. It was working fine for the discrete model. Problem right now will be to make is work for integral definition. I guess the core function of integral in Presiach plate should be something interesting.

This model was not easy to learn. It was something very obscure for more. I just follow the Wikipedia and its links to make it work. I figure that the knowledge is free in these days. But, to do the job it is not only the knowledge that is important. It is the experience. And, no one is going to ask you to do something unless there is problem.