Continuous design
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Continuous design is a software development practice of creating and modifying the design of a system as it is developed, rather than specifying the system completely before development starts, (as in the waterfall model) or in bursts at the beginning of each iteration (as in the iterative model). Also called "evolutionary design" or "incremental design", continuous design was popularized by extreme programming. Continuous design also uses test driven development and refactoring. It is similar to, and generally used with, continuous integration.
Martin Fowler wrote a popular book called Refactoring, as well as a popular article entitled "Is Design Dead?", that talked about continuous/evolutionary design. Jim Shore wrote an article IEEE titled "Continuous Design".