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| | Waterfall model - Wikipedia, the free encyclopedia |
 | | The waterfall model is a software development model (a process for the creation of software) in which development is seen as flowing steadily downwards (like a waterfall) through the phases of requirements analysis, design, implementation, testing (validation), integration, and maintenance. |
 | | The waterfall model is widely used, including by such large software development houses as those employed by the US airforce (see "the waterfall model"), the US Department of Defense and NASA, and upon many large government projects (see "the standard waterfall model"). |
 | | The idea behind the waterfall model may be "measure twice; cut once", and those opposed to the waterfall model argue that this idea tends to fall apart when the problem being measured is constantly changing due to requirement modifications and new realizations about the problem itself. |
| en.wikipedia.org /wiki/Waterfall_model (2804 words) |
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