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Why or when to prefer Waterfall methodology over Agile?

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Why or when to prefer Waterfall methodology over Agile?

The waterfall methodology provides a structured approach; the model itself progresses linearly through discrete, easily understandable and explainable phases and thus is easy to understand; it also provides easily identifiable milestones in the development process. It is perhaps for this reason that the waterfall methodology is used as a beginning example of a development model in many software engineering texts and courses:

  • Simple and easy to understand and implement.
  • Easy to manage due to the rigidity of the model - each phase has specific deliverables and a review process.
  • Suited to projects where requirements and scope are very well documented and fixed, the product itself is firm and stable, and the technology is clearly understood.
  • The entry and exit criteria are well defined, so it easy and systematic to proceed with quality.
  • Results are well documented including technical documentation.
  • Easier to measure progress by reference to clearly defined milestones.
  • Quality is the focus of the first phase itself since rework is costly in subsequent phases.
  • Testing is easier as it can be done with reference to the scenarios defined based on the functional specification.
  • The total cost of the project can be accurately estimated after the requirements have been defined.

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