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The spiral model emphasizes risk analysis, which makes developers and users

Understand the risks of each evolutionary layer and then formulate corresponding countermeasures.

Should be, so it is especially suitable for large, complex and have.

High risk system. For these systems, risk is indispensable in software development.

Depending on the potential unfavorable factors, it may be damaged to varying degrees.

Harm the software development process and affect the quality of software products.