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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"). |
 | | Many software projects must be open to change due to external factors; the majority of software is written as part of a contract with a client, and clients are notorious for changing their stated requirements. |
| en.wikipedia.org /wiki/Waterfall_Model (2688 words) |
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