What are the four common software development models?

Four common software development models are: 1. V model, which aims to improve the effectiveness and efficiency of software development and reflects the relationship between testing activities and analysis and design activities. 2. The W model is composed of two V-shaped models, and the distribution represents the testing and development process. 3. H model. 4. X model, separate coding and testing of individual program fragments.

The operating environment of this tutorial: Windows 7 system, Dell G3 computer.

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The software development life cycle model refers to the process of software products from initial conception to public release. There are various aspects in the process of developing software. Different methods, let me briefly talk about the different testing technologies used in different development modes.

1. V model (Waterfall model)

                                                                                                                                                                                 The software development model aims to improve the effectiveness and efficiency of software development and reflects the relationship between testing activities and analysis and design activities. It is pointed out that unit and integration testing should test whether the execution of the program meets the requirements of the software design; system testing should test whether the system functions and performance quality characteristics meet the system requirements; acceptance testing determines whether the software implementation meets user needs or contract requirements. . Each test link is carried out according to steps. Only after one test is completed can the next test be started. This model is not very practical, and if problems are discovered later, repair costs are high.

The W model is composed of two V-shaped models. The distribution represents the test and The development process, testing and development are carried out simultaneously, which is conducive to comprehensive discovery of problems this morning. Activities such as requirements, design, and coding are regarded as serial. Testing and development activities maintain a linear relationship and cannot support iteration. development model.

                                                                                                                                                                                                                 , carried out concurrently with other processes, different test activities can be carried out in a certain order. As long as a certain test reaches the readiness point, the execution test will start, which has strong flexibility.

Through frequent handovers, executable programs are finally synthesized through integration. If you want to read more related articles, please visit

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