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Iterative model in sdlc

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Abdullah Al Rumy
Abdullah Al Rumy

The iterative model of the software development lifecycle involves developing software in cycles. Each cycle creates a new version of the software by specifying, implementing, and reviewing a part of the requirements. This allows development to begin before all requirements are known and lets the software evolve through feedback. Benefits include early detection of defects, reliable user feedback, and more time spent designing. Limitations are that each phase is rigid and costly architecture issues may arise from a lack of upfront requirements gathering. The iterative model is best for projects with clearly defined but evolving requirements or large projects where some details can change over time.

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Iterative model in sdlc Software testing tools By Md Abdullah Al Rumi
Definition An iterative lifecycle model does not attempt to start with a full specification of requirements. Instead, development begins by specifying and implementing just part of the software, which can then be reviewed in order to identify further requirements. This process is then repeated, producing a new version of the software for each cycle of the model.
For Example:
continue.. In the diagram when we work iteratively we create rough product or product piece in one iteration, then review it and improve it in next iteration and so on until it’s finished. As shown in the image above, in the first iteration the whole painting is sketched roughly, then in the second iteration colors are filled and in the third iteration finishing is done. Hence, in iterative model the whole product is developed step by step.
Diagram of Iterative model:
Advantages of Iterative model: In iterative model we can only create a high-level design of the application before we actually begin to build the product and define the design solution for the entire product. Later on we can design and built a skeleton version of that, and then evolved the design based on what had been built. In iterative model we are building and improving the product step by step. Hence we can track the defects at early stages. This avoids the downward flow of the defects. In iterative model we can get the reliable user feedback. When presenting sketches and blueprints of the product to users for their feedback, we are effectively asking them to imagine how the product will work. In iterative model less time is spent on documenting and more time is given for designing.
Disadvantages of Iterative model: Each phase of an iteration is rigid with no overlaps Costly system architecture or design issues may arise because not all requirements are gathered up front for the entire lifecycle
When to use iterative model: Requirements of the complete system are clearly defined and understood. When the project is big. Major requirements must be defined; however, some details can evolve with time.
Summary The word increment fundamentally means add onto. The word iterate fundamentally means re-do. Sadly, iterative development has come to mean either incremental or iterative, indiscriminately. That was an unfortunate turn for our industry since each serves a different purpose and needs to be managed differently. Incremental development gives you opportunities to improve your development process, as well as adjust the requirements to the changing world. Iterative development helps you improve your product quality. Yes, it is rework, and yes, you probably need to do some rework to make your product shine. The development process, feature set, and product quality all need constant improvement. Use an incremental strategy, with reflection, to improve the first two.

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Iterative model in sdlc

  • 1. Iterative model in sdlc Software testing tools By Md Abdullah Al Rumi
  • 2. Definition An iterative lifecycle model does not attempt to start with a full specification of requirements. Instead, development begins by specifying and implementing just part of the software, which can then be reviewed in order to identify further requirements. This process is then repeated, producing a new version of the software for each cycle of the model.
  • 4. continue.. In the diagram when we work iteratively we create rough product or product piece in one iteration, then review it and improve it in next iteration and so on until it’s finished. As shown in the image above, in the first iteration the whole painting is sketched roughly, then in the second iteration colors are filled and in the third iteration finishing is done. Hence, in iterative model the whole product is developed step by step.
  • 6. Advantages of Iterative model: In iterative model we can only create a high-level design of the application before we actually begin to build the product and define the design solution for the entire product. Later on we can design and built a skeleton version of that, and then evolved the design based on what had been built. In iterative model we are building and improving the product step by step. Hence we can track the defects at early stages. This avoids the downward flow of the defects. In iterative model we can get the reliable user feedback. When presenting sketches and blueprints of the product to users for their feedback, we are effectively asking them to imagine how the product will work. In iterative model less time is spent on documenting and more time is given for designing.
  • 7. Disadvantages of Iterative model: Each phase of an iteration is rigid with no overlaps Costly system architecture or design issues may arise because not all requirements are gathered up front for the entire lifecycle
  • 8. When to use iterative model: Requirements of the complete system are clearly defined and understood. When the project is big. Major requirements must be defined; however, some details can evolve with time.
  • 9. Summary The word increment fundamentally means add onto. The word iterate fundamentally means re-do. Sadly, iterative development has come to mean either incremental or iterative, indiscriminately. That was an unfortunate turn for our industry since each serves a different purpose and needs to be managed differently. Incremental development gives you opportunities to improve your development process, as well as adjust the requirements to the changing world. Iterative development helps you improve your product quality. Yes, it is rework, and yes, you probably need to do some rework to make your product shine. The development process, feature set, and product quality all need constant improvement. Use an incremental strategy, with reflection, to improve the first two.