The second step is to set up use case diagram, concept model, collaboration diagram and class diagram.3.
2)用UML对找到的主要功能建立用例图,概念模型,协作图,设计类图。
参考来源 - 基于回归分析和UML的敏捷建模研究
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Use Case Diagram
abstract:A use case diagram at its simplest is a representation of a user's interaction with the system and depicting the specifications of a use case. A use case diagram can portray the different types of users of a system and the various ways that they interact with the system.