Criticisms of the Standard Waterfall Model

There have been a number of criticisms of the standard waterfall model, including

  • Problems are not discovered until system testing.
  • Requirements must be fixed before the system is designed — requirements evolution makes the development method unstable.
  • Design and code work often turn up requirements inconsistencies, missing system components, and unexpected development needs.
  • System performance cannot be tested until the system is almost coded; undercapacity may be difficult to correct.

The standard waterfall model is associated with the failure or cancellation of a number of large systems. It can also be very expensive.

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