Iterative Model – Software Engineering

Here in this Tutorial we will discuss about the Iterative Modelin software Engineering Tutorial. The tutorial is helpful for beginners and experience professionals.


The iterative process model is a software development life cycle (SDLC) technique in which initial construction work is carried out based on well stated basic requirements, and following functionalities are added to the current software product via iterations until the final system has been implemented. The goal of this SDLC technique is not to generate a detailed specification plan.

The Spiraliterative development approach, on the other hand, is a strategy for breaking down any large software development project into smaller pieces. It was created with the intention of starting with the minimum standards and building a section of the application incrementally. After that, the prototype is checked for any further requirements, and the rest of the planning, requirement specification, implementation, and support is completed.

Features of the Iterative Model

The iterative model has the following characteristics:

  • It allows users to objectively demonstrate and measure the development of the project.
  • The project’s capabilities improves incrementally.
  • It allows you to increase the project’s quality by adding content.
  • It helps you reduce your risk by making continual changes.
  • The accuracy of the numerous estimates that may be part of that process can improve significantly.
  • The cyclic model is another name for it. Following the initial phase, some phases repeat themselves, with the potential for development with each phase’s completion.
  • Finally, it aids in improving team excitement, cooperation, and performance.

Phases of the Iterative Model

  1. Requirement and Planning Stage:At this stage, an analyst assesses whether or not the requirements will be met within the allotted budget. This process results in an estimation of a company’s business needs, hardware feasibility, and software compatibility.
  2. Design Stage:The project team receives the entire list of requirements to begin working in a certain direction during this phase. They use various models like as a flow chart, sequence diagrams, er diagrams, transition probability diagram, and so on to gain a clear knowledge of the programming and to aid in development. Based on their research, developers come up with several of possible solutions. The size and importance of the project are also crucial factors in deciding the amount and complication of concept design.
  3. Coding Stage:During this stage of the project, the construction process of the synthetic methodology. The study and design that emerged from the Designing Phase will drive next phase. All needs, planning, and design plans have been carried out and programmed. The developer will use established programming and measurement requirements to execute the desired design. They should construct a functional testing at every stage of code generation. The goal of this stage should be to produce a full functioning, accessible solution for that iteration. The complexity of work and time invested on this version will vary depending on the scope.
  4. Testing Stage:This step includes comparing the current setup iterations to a set of criteria and conventions to see whether it complies. This level of assessment includes things like performance monitoring, test execution, information security, requirement testing, user testing, multi-site testing, incident management testing, and so on. A developer or tester must guarantee that correcting one bug does not result in the introduction of new bugs in the system. The tester can create new test scenarios or reuse those from previous releases, but testing comes first because any faults would damage the software’s specifications, which will have an impact on the business.
  5. Evaluation Stage:The iterative model has reached its conclusion. Following the completion of all steps, the system built up to that time is carefully examined. The system is inspected by the development team, sponsors, and other program development teams to see whether the results meet their expectations. Based on this, a developed a special plan is designed and implemented throughout the next iteration cycle.

Iterative Model Applications

The iterative model is frequently implemented in the following scenarios:

  • The iterative approach of making new iterations and testing them to see the result is often done on engineering teams. They will list advantages and disadvantages of a problem before they work on the one that performed the best. This process is repeated until there are satisfactory results.
  • The iterative model is a repeating process. Within the world of electronics, changes are made in mobile phones to suit customer needs and adaption to new family needs. The industry reshapes itself every day based on feedback from customers.
  • Typically, digital marketing teams use A/B testing to figure out what advertising strategy is the most effective. They try various strategies to see how they can get the best engagement while also performing proper analysis. They leverage machine learning and other data science techniques in developing attractive designs that are implemented into their product marketing, and this allows them to improve their marketing strategies


Using the iterative model in the software development life cycle has many benefits. One benefit is that the iterative model is adopted early, which allows developers and testers to identify faults in a software product and take corrective action before that defect reaches the end of the process:

  • In an iterative approach, there is less time consumed documenting and more time has been spent designing.
  • It’s simple to change and adapt to the project’s and client’s changing needs.
  • This methodology is substantially less expensive to update needs than other modelling techniques because we work on the project continuously once the criteria are fixed.
  • After each loop, the end-user can quickly submit input, which can then be integrated into the system, enhancing the application’s performance.
  • Some operational capability can be generated and released to end users beginning of the software development life cycle.
  • Because the iterations happen at the same time, simultaneous development can be achieved.
  • Risks are identified and managed as early as feasible, allowing each iteration to be easily controlled.
  • Because this model has fewer iterations, testing and debugging are easier.
  • It is possible to gather reliable user input by exhibiting designs and layouts of a product to end users for feedback.


Although the iterative methodology has many advantages, it is not without defects and limits. Furthermore, because every need is not gathered at the beginning of the project’s life cycle, problems about system structure or outlines may surface at a later point. The following are some of the disadvantages of using the iterative model:

  • Despite the cheaper cost of change, it’s not very well adapted to continually changing needs.
  • Effective management is required.
  • If someone is trying to apply this approach for a smaller project, the iterative model is not the best option because breaking down small projects into smaller portions may not be practical.
  • To avoid risk, this strategy necessitates highly experienced resources to work on the project’s analysis.
  • Because all needs are not obtained adequately in advance, system design issues may develop.


Q1. What is iterative model with example?

The iterative model is a series of steps that culminates in the final product. For example, Prototyping, Rational Unified process (RUP), agile development and rapid application development are all iterative models.

Q2. Where is iterative model used?

The following are some examples of situations where an iterative model is used:

  • Once all of the system’s requirements have been thoroughly defined and comprehended.
  • While the necessary elements are given, some functionality and recommended enhancements may alter as the project development advances.
  • The development team is exploring with it and trying out a new technology while working on a project.

Q3. What is the advantage of iterative model?

Among the advantages of an iterative model is that it generates a working prototype to review early on in the project, allowing for addressing flaws early on.

Q4. What are the limitations of the iterative model?

The following are the major limitations of the iterative model:

  • Highly qualified professionals are essential for objective assessment.
  • This method may be ineffective for small projects.

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