The objective is to identify and link these key functions and data elements, yielding a logical system design.
目的是要区分并联接这些关键的功能和数据元素，随之产生逻辑系统设计。
The analysis model describes the logical structure of the system; thus it is the foundation of the design model.
分析模型描述了系统的逻辑结构，因而它是设计模型的基础。
The logical level zooms inside the system black box, exposing the high-level design of the system.
逻辑层在系统黑盒子内缩放，从而公开高级别的系统设计。
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