ITERATIVE lifecycle models

Iterative Lifecycle Models
An iterative lifecycle model does not attempt to start with a full specification o f requirements. Instead, development begins by specifying and implementing just part of the software, which can then be reviewed in order to identify further requirements. This process is then repeated, producing a new version of the software for each cycle of the model.A Requirements phase, in which the requirements for the software are gathered and analyzed. Iteration should eventually result in a requirements phase which produces a complete and final specification of requirements.

• Design phase, in which a software solution to meet the requirements is designed. This may be a new design, or an extension of an earlier design.

• An Implementation and Test phase, when the software is coded, integrated and tested.

• A Review phase, in which the software is evaluated, the current requirements are reviewed, and changes and additions to requirements proposed.

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