Incremental lifecycle model

Incremental model is an evolution of waterfall model. The product is designed, implemented, integrated and tested as a series of incremental builds. It is a popular model software evolution used many commercial software companies and system vendor.
Incremental software development model may be applicable to projects where:
  • Software Requirements are well defined, but realization may be delayed.
  • The basic software functionality are required early


    • Generates working software quickly and early during the software life cycle.
    • More flexible - less costly to change scope and requirements.
    • Easier to test and debug during a smaller iteration.
    • Easier to manage risk because risky pieces are identified and handled during its iteration.
    • Each phase of an iteration is rigid and do not overlap each other.
    • Problems may arise pertaining to system architecture because not all requirements are gathered up front for the entire software life cycle.
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