Here you can learn how to make mathematical models for real time use and learn when to use such models for controlling and supervising your process.
This site is also about the benefits of using models and soft sensor techniques for better control of the production in many cases. Use of models for control and estimation may really mean significant profit increase, better products and better environmental load of operating a process.
Good operation of a process or a system is about knowledge. If you know how your process works, this knowledge can be condensed into mathematical form and used for improved operation.