In the waterfall model, requirements engineering is presented as the first phase of the software development process. Later development methods, including the rational unified process (RUP) for software, assume that requirements engineering continues through a system's lifetime.
In the waterfall model, requirements engineering is presented as the first phase of the software development process. Later development methods, including the rational unified process (RUP) for software, assume that requirements engineering continues through a system's lifetime.
Source: Wikipedia "Requirements engineering" · CC BY-SA 4.0
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