A design description may accompany or be referenced by the plan to give a shared picture of what the planning elements apply to, covering the intended or anticipated aircraft-level functions the systems provide or support, the operating environment, the capabilities of the systems as installed, the principal means of containing faults or failures, any new or novel feature, and the architecture and design features that play a particular part in achieving or preserving the safety of the aircraft systems.
The graph holds this control, the 0 it maps to, and the evidence behind each claim, over MCP and REST.