Iterative Enhancement Model was developed to remove the shortcomings of waterfall model. In this model, the phases of software development remain the same, but the construction and delivery is done in the iterative mode. In the first iteration, a less capable product is developed and delivered for use. This product satisfies only a subset of the requirements. In the next iteration, a product with incremental features is developed.
Every iteration consists of all phases of the waterfall model. The complete product is divided into releases and the developer delivers the product release by release.
Figure 1 depicts the Iterative Enhancement Model.
This model is useful when less manpower is available for software development and the release deadlines are tight. It is best suited for in-house product development, where it is ensured that the user has something to start with. The main disadvantage of this model is that iteration may never end, and the user may have to endlessly wait for the final product. The cost estimation is also tedious because it is difficult to relate the software development cost with the number of requirements.
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