At Apple, we built our work on this basic fact. Demos made us react, and the reactions were essential. Direct feedback on one demo provided the impetus to transform it into the next. Demos were the catalyst for creative decisions, and we found that the sooner we started making creative decisions—whether we should have big keys with easy-to-tap targets or small keys coupled with software assistance—the more time there was to refine and improve those decisions, to backtrack if needed, to forge ahead if possible. Concrete and specific demos were the handholds and footholds that helped boost us up
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