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定性分析和定量分析是产品设计过程的两个重要方面，给出基于五个阶段的过程模型以及综合模态逻辑、非单调逻辑模式；同时，还从定量的角度对设计过程进行了分析。
Qualitative analysis and quantitative analysis are two important aspects of the product design process. The process model based on five stages and the integrated modal logic and nonmonotonic logic model are given. At the same time, the design process is also analyzed quantitatively.