use case diagram for online payment system

However, there is a possibility that there will be use cases that stand on their own. Note that all actors should be connected to at least 1 use case. A communication link connects each actor with the appropriate use cases. This element is what brings actors and use cases together.

An exclude is a relationship that indicates that the use case is option and will take place after the initial use case. An include is a relationship that shows that a use case is mandatory, as well as part of another use case.

You can add a use case element with an oval shape.Īt this point, we also need to mention the include and extend relationships that some use cases have. In reality, it is the component that stands for the separate functions of the system. This element is at the heart of this diagram. To add an actor to your diagram, you must create a small stick figure. All of these are referred to as actors in a use case diagram. The truth is that a single system might have many different user types. You can show the system boundary on your use case diagram with a rectangular shape. Moreover, this component can also be used to indicate the system’s different functions, especially if they are targeting different actors. The components that you must encounter in a use case diagram example are the following: #1 System BoundariesĮach system has a predefined boundary and this element shows that on the diagram. Therefore, to understand a use case diagram example, you must know what each shape represents so that you create something that all your colleagues will understand. As in every other diagram type, a use case diagram has some specific notations and shapes that indicate each element. Use Case Diagram ComponentsĪfter learning the role of a use case diagram, you must learn all about its components. This clearly establishes the connection between them, as well as other extended connections. Therefore, a use case diagram example includes all possible user types (or actors) and their use cases. This type belongs to the behavioral diagram of UML because it notes all the ways that users can interact with the system. Keep reading!īefore we get into the examples though, it is important to briefly explain what a use case diagram is. In this article, you’ll learn all basics about a use case diagram and 8 excellent use case diagram examples. In this case, you may need a use case diagram example that will show you all the elements and components that you need to include. So, if you are using it in your project, there is a high chance that you must create a use case diagram. A use case diagram is one of the 14 different types of diagrams that exist with the Unified Modeling Language (UML).

Use case diagram for online payment system