用例模型是从应用领域(Application domain)的角度,面向用户的一种模型,旨在描述用户眼中(而非程序员眼中)此系统的功能行为。以下是一张用例图,先有一个大致的印象: 一个售票系统的用例图 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...
What is a purpose of a Use Case diagram? 用例图的目的是什么? A.Functional decomposition/ 功能分解B.Identification of functional requirements/功能需求的识别C.To define sequences of actions/ 定义动作顺序D.To identify multiplicities/识别多样性
there are five diagrams available to model the dynamic nature and use case diagram is one of them. Now as we have to discuss that the use case diagram is dynamic in nature, there should be some internal or external factors for making the interaction...
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。
Use case diagram uses The reasons why an organization would want to use case diagrams include: Represent the goals of systems and users. Specify the context a system should be viewed in. Specify system requirements. Provide a model for the flow of events when it comes to user interactions. ...
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...
Use case diagrams are drawn to capture the functional requirements(功能需求) of a system. The guidelines for drawing a use case diagram 🥖 the use case's name can identify thefunctionalities performed. 🥖 a suitable name for actors.
A UML use case diagram is the primary form of system/software requirements for a new software program underdeveloped. Use cases specify the expected behavior (what), and not the exact method of making it happen (how). Use cases once specified can be denoted both textual and visual ...
The use case diagram is an important part of Unified Modeling Language (UML) which describes the usage requirements for a system in design. Use case diagrams follow a top down approach of defining a system in which the obvious high level functions are present. It acts as a bridge between bu...