Incremental Model is a Model in Software development where the client’s requirements are divided into multiple standalone modules, where each and every module passes through these phases – requirements, design, implementation, and at last testing phases.
After breaking the requirements into multiple standalone modules and develop each module using the waterfall model approach and then incremented each module to the previous release.
You can understand by its name INCREMENT MODEL- which means to increase further or to go ahead.
Software is broken into modules so, at any time, the plan is made just for the next increment and not for any kind of long-term plan. Thus it will be easier to modify the version as per clients’ needs. The developer Team first focuses on developing the core features of the system.
After the core features are developed, then these are again developed to increase the functionality by adding some new features in successive versions. And these versions are developed by using Waterfall Model.
After completing the successive versions of software it is delivered to the customer for its feedback and after his feedback is updated to a new version.
How incremental model works:
1. Requirement analysis: In this, the product analysis team identifies the requirements directly from HR or the Client. Then all the system functional requirements are understood by the Analysis team. This is a very crucial role because one wrong analysis destroys the whole software, so in this team mainly expertise, Senior Developer and Senior Managers take responsibilities.
2. Design & Development: In this phase the design of all the requirements and system functionalities are finished. We can say that a blueprint of Software.
After this, the development team develops and codes according to the requirements and the design of the software.
3. Testing: The testing team checks the performance of each existing function as well as additional functionality. Testing is used to check, various methods behavior of each task.
4. Implementation: In this phase opens the coding phase of the development system. This is the final coding and after this testing, functionality is done. After this product is upgraded up to the final system product.
When Incremental Model Is Used?
- When the requirements and clients are superior.
- When a project is too lengthy to develop.
- When your Software teams are not skilled teams.
- When the customer demands are quick for the release of the product.
Advantages of Incremental Model
- Tester can easily recognize Errors.
- Very Easy to Test and Debug Errors.
- Simply to manage risk because it is handled during its iteration.
- The Client can get important functionality early.
Disadvantage of Incremental Model
- Needed good planning.
- Totaly high Costing.
- Developers need a Well-defined module interface.
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