
there is some relationship to the structure of the thing being designed;
• there is some relationship to the functions of the thing being designed.
There is much to be done here, as there is in the study of structures for diagnosis, to
establish the principles of hierarchy construction.
7.2.11 Performance Degradation
We suspect that as designs get to be on the edge of being Class 3 the
performance of the system will degrade in interesting ways. By observing this
behavior, and the ease with which design knowledge for an object can be captured,
we hope to be able to make observations about subclasses of design more precise
than the classes tha ...