One tool that is useful during both anal

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问题 One tool that is useful during both analysis and design is the(  ),which is a pictorial representation of the items of information(entities) within the system and the relationships between these pieces of information.A.data dictionaryB.dataflow diagramC.use case diagramD.entity-relationship diagram

选项 A.data dictionary
B.dataflow diagram
C.use case diagram
D.entity-relationship diagram

答案 D

解析 实体关系图是一个在分析与设计阶段都很有用的工具,它主要是用图形的方式来表示系统内部的各种信息条目(实体)以及它们之间的相互关系。
A.数据字典B.数据流图 C.用例图D.实体关系图
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