There is no direct mapping between a use case and a single category of change. The category, which each use case will fall into, is dependent on the scale and scope of the request. This may change as the Request progresses through the elaboration phase and full implications are defined. It can be said however that use case 11, 13 & 16 would rarely (if ever) fall into the simple category. The change owner based on their understanding of the scope will initially categorize the request. The categorization may be changed during the elaboration stage.