为了更好地理解以模型为中心的开发的概念，需要退一步回到源代码并且分析系统的行为。
To better understand model-centric development concepts, take a step back from the code and analyze the behaviour of your system.
相反，系统分析人员对用例关系图中描述的概念感兴趣，而对构造和部署的细节不太感兴趣。
By contrast, a system analyst is interested in the functionality described in the use-case diagram and less interested in the details of construction and deployment.
PASW Modeler使用流的概念来定义数据流如何通过分析系统。
PASW Modeler USES the concept of streams to define how data flows through the system for analysis.
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