what is Incremental model ?

In incremental model the whole requirement is divided into various builds.

Each module passes through the requirements, design, implementation and testing phases

Diagram of Incremental model:

Incremental model is a method of software development where the product is designed,

implemented and tested incrementally until the product is finished.

Each subsequent release of the module adds function to the previous release. The process

continues till the complete system is achieved.

When we work incrementally we are adding piece by piece but expect that each piece is

fully finished. Thus keep on adding the pieces until it’s complete.

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

• 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’s

iteration.

• 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.

• There are some high-risk features and goals.