Iterative Waterfall Model

Last Updated : 9 Jul, 2026

The Iterative Waterfall Model is an enhanced version of the Classical Waterfall Model that introduces feedback loops between phases, allowing earlier stages to be revisited when issues or changes are identified.

  • Allows errors to be identified and corrected early.
  • Supports changes by revisiting previous phases.
  • Reduces the cost and effort of correcting defects through early feedback.
waterfall_methodology

Phases of Iterative Waterfall Model

1. Requirements Gathering

  • Business owners and developers discuss project goals
  • Functional and non-functional requirements are collected
  • Requirements are clearly documented

2. Design

  • A preliminary system design is created
  • Architecture, database, and interface design are planned
  • Design can be revised based on feedback

3. Implementation

  • Developers write the code based on the design
  • The system is implemented based on the approved design.
  • Errors found can send feedback to the design phase

4. Testing

  • The software is tested to ensure it meets requirements
  • Bugs and issues are identified early
  • Necessary corrections are made through feedback loops

5. Deployment

  • The software is deployed and made available to users
  • The completed software is deployed for use by end users

6. Review and Improvement

  • System performance is reviewed
  • Improvements and refinements are made

When to use Iterative Waterfall Model?

  • Requirements are mostly clear but may need refinement
  • Team is learning new technologies
  • Project has a high risk of future changes
  • Large projects with limited resources
  • When early error detection is important

Application

  • Projects with stable core requirements
  • Enterprise applications with well-defined requirements
  • Large projects divided into manageable phases
  • High-risk projects requiring regular validation

Advantages

  • Early detection and correction of errors
  • Improved collaboration between developers and clients
  • Better flexibility than classical Waterfall
  • Regular testing improves quality
  • Improved product quality through iterative feedback.
  • Reduced project risk

Disadvantages

  • Changes after development starts are difficult
  • No partial or incremental delivery
  • Phases cannot overlap
  • No formal risk management mechanism
  • Customer involvement is limited compared to Agile models.
Comment

Explore