Typical life cycle model of information system project

One 、 Waterfall model

describe

Stage

1. Feasibility analysis （ plan ）
2. Demand analysis
3. software design （ Summary Design 、 Detailed design ）
4. code （ Including unit test ）
5. test
6. Operation and maintenance

characteristic

1. Accept the work object of the activity as input from the previous development activity
2. Use this input , What should be done to implement this activity
3. Give the work results of this activity , As output to the next development activity
4. Review the implementation results of this activity

Applicable scenario

• Applicable to development software with small cost , Needs are clear , The changes are minor

Two 、 Spiral model