What I was happy to find was that both sketch and prototype are pieces or, according to Bill, phases in the design process. “Essentially, the investment in a prototype is larger than that in a sketch, hence there are fewer of them, they are less disposable, and they take longer to build.” I found Bill’s discussion useful, as I hadn’t thought the two were all that different. I found this short essay by interaction design pioneer Bill Buxton that spoke to the difficulty of defining design compared with the relative ease of defining a clear distinction between a sketch and a prototype.
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