Common models in software development

Catalog

1. Waterfall model

2. Spiral model

3、4. iteration 、 Incremental model

5. Agile model

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1. Waterfall model

Demand analysis — plan — Design  — code — test

advantage ： Each stage is relatively independent , Focus on requirements analysis and software testing ;

shortcoming ： Unable to adapt to changes in demand , Only after testing the code , Lead to early defects can not be found in time , Unable to correct in time ;

Use project ： It is suitable for projects with stable demand .

2. Spiral model

  advantage ： Emphasize software quality , Rigorous risk analysis is carried out for each iteration , Provide discussion on whether the project is necessary to proceed ;

shortcoming ： Introduce risk management , Will invest a lot of manpower and material resources ;

Applicable items ： The early demand is not very clear , And there are risks , The project is relatively large system development .

3、4. iteration 、 Incremental model

example ： A system has A、B、C、D Four functions , It is required to complete in two weeks ;

Iterative model ： In the first week A、B、C、D Basic functions of four modules , Second week improvement ;（ Stronger risk resistance ）

Incremental model ： In the first week A、B function , In the second week C、D function .

5. Agile model

Can adapt to changes in demand ;

characteristic ：

Individuals and interactions are more important than processes and tools ;

The available software is finally fully documented ;

Customer collaboration finally leads to contract negotiation ;

Respond to changes and finally follow the plan ;

In every contrast alignment , The latter is not worthless , But the former is more important .

summary ： Light document , Light process , Heavy target , quality

The goal is ： Deliver a high-quality available software

scrum technological process ：

① Release planning meeting

② Iteration planning meeting

③ Development process , Daily station will

④ Product demonstration review meeting

⑤ Retrospective meeting