By modeling use-case, UML can describe the external roles that are interested in system and the requirement of function of system.
通过用例建模，描述对系统感兴趣的外部角色及其对系统的功能要求。
Finally, we expatiate the basic requirement and function of MDO framework, and implement a simple framework for the easy use of the collaborative optimization.
最后阐述了多学科设计优化计算环境的基本功能和要求，并通过程序设计了一个简单的协同优化方法的计算环境。
It analyzes the system with the use case picture in UML during the course of requirement analysis and divides the function module and provides the important workflow in the system.
在需求分析阶段运用UML中的用例图分析了系统的主要用例，划分了功能模块并给出了系统中重要的工作流程。
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