Agility, code and design

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As Jack expands on the implications of the source code being the design, he clearly demolishes the assumptions behind a traditional waterfall approach to development by emphasizing the need for the design to evolve and be refined. "Eventually, we have to create the real software design, and it will be in some programming language. Therefore, we should not be afraid to code our designs as we derive them. We simply must be willing to refine them as necessary. ... All design activities interact. A good software design process recognizes this and allows the design to change, sometimes radically, as various design steps reveal the need."
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From here.

3 articles about this idea: here.