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If “hardware” consists of transistors, integrated circuits, solder, copper, glass epoxy board, etc., then anything placed on paper to describe hardware is a model. A great variety of models have been and continue to be used for a variety of purposes. We analyze models; we synthesize models; we communicate with others and computing machines via models. Some models such as circuit schematics, mechanical drawings, printed circuit art work, wiring lists, etc., are very explicit and offer the great detail necessary to fabricate hardware. They may reveal what the hardware looks like, but the organization, operation, and function of the hardware are difficult to determine from such models because of their volume and because they do not attempt to clearly reveal such things.