Modification or upgrade can occur after the system development, at various levels. On one extreme, to upgrade the machine to the commercial grade, we may want to add the Operation-level control system to prepare for the automation and system integration at the customer site. On the other hand, we may simply want to add a few more stages in the Step_LD to enhance the loading reliability. In either case, the AD tables and matrices are first consulted, and how each component should be designed and its effect to the rest of the system are studied using the design matrices. For example, the Operation-level control system should utilize and communicate with the existing components of the current control system and should not create constrains to the lower-level systems.