Iterative Model

The Iterative Model is a cyclical software development process where the development cycle is divided into smaller iterations or increments. Each iteration results in a working version of the software that is progressively refined and improved upon in subsequent iterations. This approach allows for continuous feedback, adaptation to changing requirements, and early identification of issues.

In the below PDF we discuss about  Iterative Model in detail in simple language, Hope this will help in better understanding.

Characteristics of Iterative Model:

  • Repetitive Cycle: The development process is divided into multiple iterations, with each iteration comprising the phases of planning, designing, building, and testing.
  • Incremental Development: The software is built incrementally, with each iteration adding new features or enhancements. This enables stakeholders to see tangible progress at the end of each iteration.
  • Continuous Feedback: Stakeholder feedback is collected regularly at the end of each iteration. This feedback loop facilitates improvements and corrections early in the development process.
  • Flexible and Adaptive: The model allows for flexibility in accommodating changes and evolving requirements. Adjustments can be made at the beginning of each iteration based on feedback and lessons learned.
  • Risk Management: Risks are identified and addressed throughout the development process. By tackling high-risk items early in the iterations, the overall project risk is minimized.

Phases of Iterative Model:

The Iterative Model typically consists of the following phases:

  • Requirements Gathering: Initial requirements are collected and analyzed to define the scope of the project.
  • Iteration Planning: Each iteration begins with a planning phase where tasks are defined, priorities are set, and goals are established.
  • Iterative Development: The development team implements the features and functionalities defined for that iteration.
  • Testing: Rigorous testing is conducted to identify defects and ensure that the software meets quality standards.
  • Evaluation and Feedback: The completed iteration is evaluated by stakeholders, and feedback is gathered for further improvements.
  • Iteration Review: Lessons learned from the iteration are reviewed, and adjustments are made for the subsequent iterations.

Advantages of Iterative Model:

  • Adaptability: The ability to accommodate changes and adapt to evolving requirements.
  • Early Detection of Issues: Problems are identified early in the development process, minimizing costly fixes in later stages.
  • Customer Collaboration: Regular feedback from customers ensures that the final product aligns closely with their expectations.
  • Reduced Risk: Risks are managed proactively, reducing the likelihood of project failure.
  • Enhanced Quality: Continuous refinement leads to a higher quality end product.


In conclusion, the Iterative Model offers a pragmatic approach to software development, emphasizing adaptability, collaboration, and continuous improvement. By breaking down projects into manageable iterations and incorporating feedback loops, teams can build high-quality software that meets evolving customer needs. While it presents certain challenges, the benefits of the Iterative Model far outweigh its drawbacks, making it a favored methodology in today’s fast-paced and competitive development landscape.

Related Question

The Iterative Model is a software development approach where the development cycle is divided into smaller, repetitive iterations. Each iteration involves a complete development cycle, including planning, requirements analysis, design, coding, testing, and deployment.

Unlike the Waterfall Model, which follows a linear sequential flow, the Iterative Model is cyclic and allows for feedback and changes throughout the development process. It emphasizes revisiting and refining earlier stages based on insights gained in subsequent iterations.

Key characteristics of the Iterative Model include incremental development, repeated cycles of refinement, continuous feedback, flexibility in accommodating changes, and a focus on delivering a working product after each iteration.

Advantages include early detection and resolution of issues, flexibility to adapt to changing requirements, improved stakeholder engagement and feedback, incremental delivery of functioning software, and better risk management.

The phases generally include requirements gathering and analysis, design, implementation (coding), testing (including integration and system testing), and evaluation. Each iteration may cover all these phases in a smaller scope compared to traditional waterfall phases.


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