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...
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...
Use Case Diagram Tool Tutorial Tips for UML Use Case Diagrams When thinking of use cases, think of the end goal of a user. They don't want to "login" or "sign up." That's not a use case. The use case is more like "make a purchase." ...
16、 views products online.Discussion ExerciseDraw a use case diagram for the scenario below:Exercise - SolutionSession ObjectivesAt the end of this lecture You will be able to :Draw a use case diagram to depict functionalrequirements of a system.Expose typical mistakes by students.Write use case...
The figure below shows a use case diagram example for a vehicle system. As you can see even a system as big as a vehicle sales system contains not more than 10 use cases! That's the beauty of use case modeling. The use case model also shows the use of extend and include. Besides,...
Lecture SeriesRequirements Modeling (Use Case Diagram + Use Case Description) Session ObjectivesAt the end of this lecture You will be able to :Draw a use case diagram to depict functional requirements of a system.Expose typical mistakes by students.Write use case description for a use case. us...
Use Case Diagram 1、确定参与者(actor) 1.1用户 使用ATM自动取款机进行现金交易。进行余额查询、设置密码、修改密码、转账等操作。 1.2银行管理员 对用户的需求进行接收,通过与数据库的交互,根据对用户应用服务的响应,更新数据库中用户的信息。 2、参与者(actor)用例图...
Finding an online Use Case Diagram tool? Just click the Draw button below to create your Use Case Diagram online. Visual Paradigm Online is free* and intuitive. You can also go through this Use Case Diagram tutorial to learn about Use Case Diagram before you get started. Draw Now Use...
用例模型基本组成部件是Use Case(用例)、Actor(参与者)和System Boundary(系统边界)。用例模型可以由若干用例图组成。 A.2、Use Case Diagram(用例图) 用例模型由用例图构成。用例图中显示用例、参与者和用例之间的关系。用例图在宏观上给出模型的总体轮廓,而用例真正实现细节则以文本的方式书写。用例图所表示的...