Post-it Notes could be the next big thing in corporate innovation, especially for brainstorming, says IDEO CEO Tim Brown. Paper's portability and flexibility are ideal for this stage, writes David Lavenda. "Furthermore, paper affords free-form annotation, so marking up ideas with a pen or marker is simple. Paper also affords following a history of ideas, since one note can be laid directly on top of another," Lavenda writes.

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