用例是描述用户和系统之间交互的人的模型。用例的价值在于它帮助用户自己执行任务，这样他们就可以确定支持每个步骤所需的功能。此外，用户必须只考虑步骤后的内容，这使得他更容易正确地识别所有以前的步骤和所有后续步骤，而不遗漏任何步骤。用例描述了用户需要做什么，他想要完成什么，以及在使用软件时系统如何响应。
A use case is a model of a person who describes the interaction between a user and the system. The value of a use case is that it helps users perform tasks themselves, so they can identify the features they need to support each step. In addition, the user must only consider the content after the step, which makes it easier for him to correctly identify all previous steps and all subsequent steps without missing any steps. The use case describes what the user needs to do, what he wants to accomplish, and how the system responds when using the software.
Example 1:
Example 2:
Example 3:
Unified Modeling Language (UML) References
- What is UML?
- Why UML Modeling?
- Overview of the 14 UML Diagram Types
- What is Class Diagram?
- What is Component Diagram?
- What is Deployment Diagram?
- What is Object Diagram?
- What is Package Diagram?
- What is Composite Structure Diagram?
- What is Profile Diagram?
- What is Use Case Diagram?
- What is Activity Diagram?
- What is State Machine Diagram?
- What is Sequence Diagram?
- What is Communication Diagram?
- What is Interaction Overview Diagram
