Incremental Model of Software Development Model

Incremental Model)

It is also called an evolutionary model. Similar to building, software is also built step by step. In the incremental model, the software is designed, implemented, integrated, and tested as a series of incremental components. Each component is formed by a variety of interactive modules to provide specific functions.CodeSegment composition. The incremental model does not deliver a complete product that can run at each stage, but rather delivers a subset that meets the customer's needs. The entire product is divided into several components, and developers deliver the product one by one. The advantage of this is that software development can better adapt to changes, and customers can constantly see the developed software, this reduces development risks. However, the incremental model also has the following defects:

(1) Since each component is gradually incorporated into the existing software architecture, adding the component must not destroy the structure of the system, which requires the software to have an open architecture.

(2) demand changes are inevitable during the development process. The flexibility of the incremental model makes it better to adapt to this change than the waterfall model and the rapid prototype model, but it is also easy to degrade to the side-to-side modeling, instead, the control of software processes loses integrity.

When using the incremental model, the first increment is usually the core product that meets basic requirements. After core products are delivered to users for use, they form the next incremental development plan, which includes modifications to core products and release of some new features. This process repeats after each incremental release until the final perfect product is produced.

For example, you can use an incremental model to develop a word processing software. You can consider that the first step is to incrementally release basic file management, editing, and document generation functions, and the second step is to release more comprehensive editing and document generation functions, the third step is to check spelling and grammar, and the fourth step is to complete advanced page layout.