"Design is the art of gradually applying constraints until only one solution remains."
— Unknown
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Here is a model to make visible the process of designing solutions.
Successful teams first define the problem they are trying to solve—they articulate it and give it boundaries (what's part of the problem, what's outside our control). They call upon designers to help cull, visualize, express that problem in human terms— looking at it from many different views.
Once you know where you want to go you need to create a map to get there. That map must be imprinted in the minds of every participant along the way. Designers can literally make the map real.
That might mean physically prototyping it: building it in miniature, or as a one-off, to see if it will work. Or, it might mean prototyping a new customer experience— a collection of moments that make up an experience. In either case, designers play a critical role.
This is the culmination of many steps of hard work. If we do our jobs right, we can often be the pivotal voice in this step, helping argue for the best overall solution— we can visualize the case, see different sides of the problem and lay out a path for making a commitment to a given solution.
Source: AIGA