atterns specify generic relations among abstract design elements. We hypothesize that design patterns are productive units of analogical transfer in design. We describe a normative theory of analogy-based design called model-based analogy (or MBA) that transfers design patterns from source cases to target problems. In particular, for the domain of physical devices, we identify a class of design patterns, eneric teleological mechanisms (or GTMs), that specify generic functional relations in, and abstract causal structure of, a class of devices. While GTMs provide a partial content account of analogical transfer, MBA provides a process account of acquisition, access, and use of GTMs. In particular, MBA shows how structure
Ashok K. Goel, Sambasiva R. Bhatta