Models drawn by the system analysts during the process of the structured analysis are(72).
Models drawn by the system analysts during the process of the structured analysis are(72).
A.PERTs
B.EMV
C.UMLs
D.DFDs
题目翻译:在结构化系统分析过程中绘出的模型图是DFD图。数据流图(DataFlowDiagram,DFD)是一种能全面地描述信息系统逻辑模型的主要工具,它可以用少数几种符号综合地反映出信息在系统中的流动、处理和存储情况。DFD由数据流、加工、数据存储和外部实体4个要素构成。外部实体是指存在于软件系统之外的人员或组织,它指出系统所需数据的发源地和系统所产生数据的归宿地。
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