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软考 系统架构设计师 简明教程 | 软件系统建模
2022-07-27 12:53:00 【万猫学社】
软件系统建模
软件系统的建模过程是：
现有系统对应的物理系统，通过模型化形成物理模型，再通过抽象化形成逻辑模型，再通过调整和优化形成新系统的逻辑模型，再通过实例化形成物理模型，最后通过具体化形成物理模型，如下图：
其中，逻辑模型对应的是需求分析，物理模型对应的是软件设计。
结构化建模方法
结构化建模方法是以过程为中心的技术，可用于分析一个现有的系统以及定义新系统的业务需求。
结构化建模方法所绘制的模型称为数据流图（Data Flow Diagram，DFD） 。
DFD从数据传递和加工的角度，利用图形符号通过逐层细分描述系统内各个
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