the idea that design should be done in repeated cycles where, in each cycle, the design is elaborated, refined, and tested, and the results of testing at each cycle feed into the design focus of the next cycle.
This is identical in spirit to the notion of developing a software product through a series of continually-refined prototypes, and the idea of developing generations of a software product through an iterative development cycle (such as the Spiral model of development).
- design-prototype-test cycle
- pervasive usability
- prototyping
- spiral model
- user testing
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