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Software Engineering Iterative Waterfall Model | CrackEase

Iterative Waterfall Model in SDLC

Iterative Waterfall Model

The Iterative Waterfall Model extends the traditional Waterfall by allowing controlled feedback loops between phases so that changes discovered in later phases can be fed back to earlier ones.

  • It is similar to the Waterfall model but with added feedback paths to improve flexibility.
  • Feedback loops allow teams to revisit and revise earlier work (except typically the feasibility study).
  • Phases still follow a sequential order — a phase usually begins only after the previous one completes.
  • This model helps detect and correct errors earlier compared to strict Waterfall, reducing rework and time to fix defects.
  • Useful for projects where requirements are mostly known but may need limited adjustments during development.

Advantages of Iterative Waterfall Model

  • Easy to understand and manage due to its structured approach.
  • Feedback paths make it easier to correct mistakes discovered in later phases.
  • Better than pure Waterfall when minor requirement changes are expected.
  • Maintains clear phase boundaries and documentation, aiding project control.
  • Suitable for medium-to-large projects where full Agile may not be practical.

Disadvantages of Iterative Waterfall Model

  • Usually no feedback loop to the feasibility study phase — early feasibility mistakes can persist.
  • Not ideal when requirements are highly uncertain or expected to change frequently.
  • Can be more costly and time-consuming than simple Waterfall if many iterations are needed.
  • Lacks a formal risk management process compared to Spiral or Agile approaches.
  • Does not naturally produce prototypes for early stakeholder validation.
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