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The waterfall model is a traditional model or methodology for developing engineering systems. It is based on construction and manufacturing industry projects. It is when added to software development, particular tasks accomplished in one phase required be verifying and reviewing before coming to the next phase. The waterfall is also called the linear & sequential approach because phases flow downward to the next. In simple words, the waterfall is project management and thus project development team moves to the next phase of development if the previous step is completed successfully.