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Waterfall Model

Waterfall Model

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 software development 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 software testing starts only after the development is complete. In waterfall model phases do not overlap.

When to use waterfall model

  • This model is used only when the requirements are very well known, clear and fixed.
  • Product definition is stable.
  • Technology is understood.
  • There are no ambiguous requirements
  • Ample resources with required expertise are available freely
  • The project is short.

Advantages of Waterfall model

  • This model is simple and easy to understand and use.
  • It is easy to manage due to the rigidity of the model – each phase has specific deliverables and a review process.
  • In this model phases are processed and completed one at a time. Phases do not overlap.
  • Waterfall model works well for smaller projects where requirements are very well understood.