One of the main problems with the waterfall model is that the requirements often are not completely understood in the early development stages. When you reach the future stages, you may discover that you need to adjust the requirements.
Prototyping can be useful in determining how a design meets a set of requirements. You can build a prototype, adjust the requirements, and revise the prototype several times, gaining an understanding of the project’s overall goals. In addition to clarifying the requirements, a prototype also defines many areas of the design at the same time.
The pure waterfall model allows for prototyping in later stages, but not in the early requirements stages.
Some drawbacks of prototyping:
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