Incremental model

Posted By on April 24, 2016

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RAD model
  • In incremental model the whole requirement is divided into various builds. Multiple development cycles take place here, making the life cycle a“multi-waterfall” cycle.
  • Cycles are divided up into smaller, more easily managed modules.  Each module passes through the requirements, design, implementation and testing phases.
  • A working version of software is produced during the first module, so you have working software early on during the software life cycle.
  • Each subsequent release of the module adds function to the previous release. The process continues till the complete system is achieved.

Diagram of Incremental model:

Incremental lifecycle model in software testing

Advantages of Incremental model:

  • Generates working software quickly and early during the software life cycle.
  • This model is more flexible – less costly to change scope and requirements.
  • It is easier to test and debug during a smaller iteration.
  • In this model customer can respond to each built.
  • Lowers initial delivery cost.
  • Easier to manage risk because risky pieces are identified and handled during it’d iteration.

Disadvantages of Incremental model:

  • Needs good planning and design.
  • Needs a clear and complete definition of the whole system before it can be broken down and built incrementally.
  • Total cost is higher than waterfall.

When to use the Incremental model:

  • This model can be used when the requirements of the complete system are clearly defined and understood.
  • Major requirements must be defined; however, some details can evolve with time.
  • There is a need to get a product to the market early.
  • A new technology is being used
  • Resources with needed skill set are not available
  • There are some high risk features and goals.
RAD model

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Posted by Akash Kurup

Founder and C.E.O, World4Engineers Educationist and Entrepreneur by passion. Orator and blogger by hobby