I think Jobs meant what he said to Fortune, and it’s an attempt to communicate the same core truth. But “Design is how it works” is a much better statement of Apple’s philosophy. Talk of a “product’s essence” (Isaacson’s words) or “the fundamental soul of a man-made creation” (Jobs’s) only serves to separate, conceptually, the art of design from the cold hard science of engineering. With just five words, “Design is how it works” expresses succinctly and accurately that engineering should and can be part of the art of design.
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Gruber on the essential relationship between design and engineering according to Steve Jobs.