What Is a Delta Model?

The incremental model is to modularize the software system to be developed, with each module as an incremental component, so as to analyze, design, code and test these incremental components in batches. The software development process using the incremental model is an incremental process. Compared with the waterfall model, using the incremental model for development, developers do not need to submit the entire software product to the user at one time, but can submit it in batches.

The incremental model, also known as the incremental model, is also known as a planned product improvement model. It starts with a given set of requirements and implements development activities by constructing a series of executable intermediate versions. The first version includes some requirements, the next version includes more requirements, and so on until the system is complete. Each intermediate version performs the necessary processes, activities, and tasks.

The incremental model is

The biggest feature of the incremental model is the modularization and componentization of the software system to be developed. Based on this feature, the incremental model has the following advantages.

1. The software system to be developed is modularized, and software products can be submitted in batches, so that users can understand the progress of software projects in time.

2.Development by component has been reduced

The incremental model brings the following effects:

1. The definition of requirements in the early stages of development is only used to determine the basic structure of the software. This allows the user to only describe the software requirements in the early stages of development, while the detailed description of the requirements can be delayed until the development of incremental components The requirements are supplemented one by one in increment components. This approach is conducive to the gradual clarity of user needs and can effectively adapt to changes in user needs.

2. The software system can arrange the development priorities according to the functions of the incremental components, and implement and deliver them one by one. This not only helps users to use the system as early as possible and can better adapt to the new software environment, but also in the process of using the system in an incremental manner, users can also gain experience in the requirements of subsequent components of the software system. This makes the software requirements definition smoother.

3. The software system is gradually expanding. Therefore, developers can gradually accumulate development experience through the development of many components. In fact, incremental development is also conducive to technology reuse. The algorithms designed in the previous components, the adopted technical strategies, and the written source code can be applied to the incremental components to be created later.

4. Incremental development also helps to reduce the technical risk of software projects as a whole. Individual components may not be available, but this generally does not affect the normal operation of the entire system.

5. In fact, when using the incremental model, the core incremental component with the highest priority will be delivered first, and as subsequent components are continuously integrated into the system, this core component will be tested the most times. This means that the most important heart part of the software system will have the highest reliability, which will make the entire software system more robust.

Comparing the waterfall model and the prototype evolution model, the incremental model has very significant advantages. However, the incremental model has higher technical requirements for software design, especially for software architecture, which requires it to have good openness and stability, and can smoothly implement component integration. When integrating each new component into the structure of an existing software system, it is generally required that this new component should change the original software structure as little as possible. Therefore, the incremental component is required to have fairly good functional independence, and its interface should be simple to facilitate the connection with the system during integration.