Although this hierarchy is very fine grained, it is highly domain independent. There isn't anything that is particular to any domain such as mechanical or electrical design in the hierarchy. It applies equally to all parametric and routine design problems which can be solved by SiFAs.
The hierarchy could be expanded for another level from the leaf nodes by specializing based on the points of view of agents participating in the conflict. If some points of view can be grouped together into classes that are present in all domains, such as points of view about manufacturability, durability, and cost, then the additional level of the hierarchy would again be domain independent. Any other specialization, for example, one that involves targets or parameters, such as stem length in the wine glass design, would certainly be highly domain dependent. This point will be discussed as a future research issue in chapter 10.