Analysis of real-time control systems by the model of packet nets

During the planning stages of a real-time control system, the planning team is more concerned about the global aspects of the system rather than the details of its different components. The first questions that have to be resolved are, What are the basic processes (or modules, or tasks) in the system? What are the data flow rates between these processes? and What are the memory and processing rate requirements of each process? Also of prime concern is how to select a suitable computer architecture to host the system and how to decompose the system on a selected distributed architecture.