The design is decoupled, because the design of a process depends on what can be done on the machine side. We may add a third DP, namely ‘Operation-level control system’ in a highly integrated and automated environment to deal with the cooperation with the supportive equipments and the communication with a higher level production management system. These systems interact with each other and as a whole handles the information flow between the user and the machine hardware. Figure 2 shows the interaction between the systems.