Tim Brown's article on prototyping points to prototyping as a foundation of a successful design. Thomas Edison not only invented the lightbulb; he invented thousands of failed bulbs, early prototypes that didn't meet his standard. This process should be implemented in any firm hoping to be successful at design. However prototypes don't have to be tangible products which are usually first to the mind. Instead, processes can be the focus of a successful prototype, as one story about emergency room workflow points out.
Prototypes do not have to be rigid well formed products either. They can be as simple as necessary to highlight certain aspects of a design. Markers and an eraser taped together can help visualize the grip for a new tool. I often think these small steps of a visual understanding don't constitute a prototype, but by changing my framework of understanding, I now know they are.
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