I had the great pleasure of hosting my dear friend David Kelley for a talk and on-stage conversation at the Rotman School last week. Apart from designing objects like the first commercial mouse, David is famous for being one of the earliest proponents of user-centered design and for being the originator of the concept of rapid, iterative prototyping. Like his iconic products, both methods are acknowledged home runs, but I have always believed the second to be a bigger contribution to the field.

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