Explain evolutionary model or incremental model

It is also called successive versions model or incremental model. At first, a simple working model is built. Subsequently it undergoes functional improvements & we keep on adding new functions till the desired system is built.

  • The incremental model combines elements of linear and parallel process flows 
  • The incremental model applies linear sequences in a staggered fashion as calendar time progresses
  • Each linear sequence produces deliverable “increments” of the software

For example, word-processing software developed using the incremental paradigm might deliver basic file management, editing, and document production functions in the first increment; more sophisticated editing and document production capabilities in the second increment; spelling and grammar checking in the third increment; and advanced page layout capability in the fourth

Explain evolutionary model or incremental model


  • Large projects where you can easily find modules for incremental implementation. Often used when the customer wants to start using the core features rather than waiting for the full software.
  • Also used in object oriented software development because the system can be easily portioned into units in terms of objects.


  • User gets a chance to experiment partially developed system
  • Reduce the error because the core modules get tested thoroughly.


  • It is difficult to divide the problem into several versions that would be acceptable to the customer which can be incrementally implemented & delivered.

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