In this waterfall model, the phases do not overlap. This means that any phase in the development process begins only if the previous phase is complete. The waterfall Model illustrates the software development process in a linear sequential flow. The Waterfall model is the earliest SDLC approach that was used for software development. In a waterfall model, each phase must be completed before the next phase can begin and there is no overlapping in the phases. It is also referred to as a linear-sequential life cycle model. ![]() ![]() The Waterfall Model was the first Process Model to be introduced.
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