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The concept fan is essentially a mind map of the design organized along different conceptual approaches to solving the problem at hand. A concept fan can serve as an idea generator, a breadth expander, and an idea organizer. The technique is particularly good at helping teams consider a wide range of conceptual approaches to solving the problem at hand while simultaneously ensuring each conceptual approach has been appropriately explored. The concept fan can help teams avoid spending an excessive amount of time in one conceptual arena, while neglecting other potentially promising conceptual approaches. This module describes what a concept fan is and explains the two fundamental ways one can be developed.