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Linear Design Model : Cyclic Design Model : Spiraling Design Cycle : Dialectical Model                           
Conversation-with-Materials Model : Learning By Design™ Cycle : Symmetric Design Cycle                            

Spiraling Design Cycle

The two design process models shown are more complicated than the Cyclic Design Model in their attempt to show the evolution of a design idea as spiraling and converging towards a solution. The model to the left, drawn from the Dartmouth Project for Teaching Engineering Problem Solving ends after a second iteration, while the model below, (taken from the NSF-funded Technology For Design project developed at TERC), shows solutions being arrived at the end of different iterations.

Neither model attempts to show that a design can be completed at any time in the cycle. Nor do these models attempt to show that there is no particular order in which the various design strategies must be done.

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