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 The Waterfall Model was 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 fully before the next phase can begin.
  • This type of model is basically used for the for the project which is small and there are no uncertain requirements.
  • At the end of each phase, a review takes place to determine if the project is on the right path and whether or not to continue or discard the project.
  • In this model the testing starts only after the development is complete.
  • In waterfall model phases do not overlap.
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