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Incremental Model

The incremental model is an intuitive approach to the waterfall model. Multiple development cycles take place here, making the life cycle a “multi-waterfall” cycle. Cycles are divided up into smaller, more easily managed iterations. Each iteration passes through the requirements, design, implementation and testing phases.

A working version of software is produced during the first iteration, so you have working software early on during the software life cycle. Subsequent iterations build on the initial software produced during the first iteration.












Advantages

1. Generates working software quickly and early during the software life cycle.
2. More flexible – less costly to change scope and requirements.
3. Easier to test and debug during a smaller iteration.
4. Easier to manage risk because risky pieces are identified and handled during its iteration.
5. Each iteration is an easily managed milestone.

Disadvantages

1. Each phase of an iteration is rigid and do not overlap each other.
2. Problems may arise pertaining to system architecture because not all requirements are gathered up front for the entire software life cycle.

When to use such model?
Such models are used where requirements are clear and can implement by phase wise. From the figure it’s clear that the requirements ® is divided into R1, R2……….Rn and delivered accordingly.
Mostly such model is used in web applications and product based companies.

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