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In this case, I think about the spiral model,

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and evolutionary prototyping model will work. Definitely you don't want to

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have a pure water from water. Why? Well because it

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is very expensive with a pure waterfall model to make

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changes during the course of the project, especially changes

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that involve requirements. Why? Because we saw that it can

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be very expensive. Whereas with the spiral model, we saw

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that being iterative, we can actually make correction throughout development.

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Similarly, with evolutionary prototyping, we keep evolving our system

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based on the customer feedback. And therefore, if something changes,

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we will get feedback right away, and we will

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be able to adapt. So the key thing here is

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that anything that is iterative works better in the

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case of changing environments. So, situations in which your requirements,

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the situation, the project might change. Whereas waterfall is

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more appropriate for situations in which the requirements are stable,

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we know the domain, and possibly we also know the technologies involved.