用例图体现了该系统能够为参与者提供的种种功能以及这些功能之间的联系。要画好一张用例图,需要把握三个元素:参与者(Actor)、用例(Use Case)和用例间的关系(Relationship)。 一、 参与者 参与者代表的是参与使用系统的一类角色,例如,读者就是图书馆这个系统的参与者。要正确把握参与者,需要注意以下几点: 1. 参与...
【用途】:帮助开发团队以一种可视化的方式理解系统的功能需求。 用例图中包含6个元素,分别是执行者(Actor),用例(Use Case),关联关系(Association),包含关系(Include),扩展关系(Extend)以及泛化关系(Generalization)。 角色(Actor):即使用本系统的有哪些角色,不同的角色使用的系统功能部分是不同的,在用例图中用小人...
I wrote User Stories, Use Case Diagram, Use Case Narrative or Project Specification by following IEEE standard also against requirement. It will for those, who are working software team and roll as a software project specification writter, use case designer, user story maker etc. ...
UML基础:用例图Use Case Diagram(1) 1. 用例图概述 用例图(Use Case Diagram):描述“用户、需求、系统功能单元”之间的关系,是参与者所能观察和使用到的系统功能模型图。 用例用于软件开发过程中的需求分析阶段。 确立系统边界分内外: (1)外,找参与者,不需要开发,但需考虑建立接口,让系统内外可以通过接口传递信...
A use case diagram looks something like a flowchart, where intuitive symbols represent the system elements. Here's a simple example: VS flowcharts Use case diagrams and flowcharts have similar looks to them, but use case diagrams have important distinctions. For one, use case diagrams represent...
用例图又称用况图,描述系统功能。 通过用例图展示待建系统的上下文范围以及它提供的功能。它描述了谁(或什么)与系统交互,外部世界希望系统做些什么。 用例着眼于为用户增加价值,提供了一种捕获功能需求的系统且直观的方法,可驱动整个开发过程。用例从某个特定参与者的角度用简单易懂的语言说明一个特定的使用场景。
在New Diagram窗口中,选择Use Case Diagram。 单击“Next”。 输入图表名(name) 称和描述 (description)。Location字段 (field) 使您可以选择一个模型来存储图表。 单击“OK”。 绘制系统元素 (drawing a system) 若要在用例图中创建系统,请在“图表”工具栏上选择“System”,然后在“图表”窗格 (diagram pane...
The name of a use case is very important. The name should be chosen in such a way so that it can identify the functionalities performed. Give a suitable name for actors. Show relationships and dependencies clearly in the diagram. Do not try to include all types of relationships, as the ...
A use case describes how a user uses a system to accomplish a particular goal. A use case diagram consists of the system, the related use cases and actors and relates these to each other to visualize: what is being described? (system), who is using the system? (actors) and what do ...
Use this to locate a use case within a System shape. xoffset Type: System.Double The location of the new shape relative to the diagram. yoffset Type: System.Double The location of the new shape relative to the diagram. Return Value Type: Microsoft.VisualStudio.ArchitectureTools.Extensibility....