The Waterfall Model was the first Process Model to be introduced. It is also referred to as a linear-sequential life cycle model. It is very simple to understand and use. In a waterfall model, each phase must be completed before the next phase can begin and chere is no overlapping in the phases. The Waterfall model is the earliest SDLC approach that was used for software development. The waterfall Model illustrates the software development process in a linear sequential ow. This means that any phase in the development process begins only if the revious phase is complete. In this waterfall model, the phases do not overlap. Explair ow efficient is Waterfall model while building software?

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