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This article mainly introduces how to use Visio to draw UML use case diagram lines, which has certain reference value. Interested friends can refer to it. I hope you will gain a lot after reading this article. Let Xiaobian take you to understand it together.

Introduction to UML Use Case Diagrams

First of all, let's look at the concept of UML use case diagram. It is mainly used to illustrate the main event flow of the system. It is mainly used to describe the customer's requirements, that is, the actions that users want the system to have to complete certain functions. It is commonly understood that use cases are the functional modules of software, so it is the starting point of the design system analysis stage. Designers create and explain use case diagrams according to customer requirements to describe what functional modules the software should have and the call relationship between these modules. A use case diagram contains use cases and actors connected by associations to reflect the overall structure and function of the system to non-technical people (usually users of the software), corresponding to the decomposition of the software structure and function.

A use case is a behavior visible from outside the system, a complete piece of service that the system provides for one or more actors. In principle, use cases are independent and juxtaposed, and there is no inclusive dependency between them. However, in order to reflect the business relationships between some use cases and improve maintainability and consistency, several relationships can be abstracted into include, extend and generalization.

Steps to Draw UML Use Case Diagrams:

1. On the File menu, point to New, point to Software, and then click UML Model Diagram.

2. In the tree view, right-click the package or subsystem that you want to contain the use case diagram, point to new, and then click use case diagram.

A blank page appears, and the UML Use Case stencil appears at the top. The workspace displays "Use Cases" as watermarks. An icon representing the chart is added to the tree view.

Note If you do not see the tree view, on the UML menu, point to View, and then click Model Explorer.

3. Drag the System Boundary shape onto the drawing page.

Use system boundary shapes

Indicating system boundaries in use case diagrams

4. Visio draws UML use case diagrams by dragging the Use Case shape from the Use Case stencil and dropping it inside the system boundary, and then dragging the Actor shape outside the system boundary.

Use case shapes

Using participant shapes

5. Use the Communication shape to indicate the relationship between use cases and actors.

Use communication shapes

Indicate the relationship between actors and use cases

6. Visio draws UML use case diagrams by indicating the relationships between use cases through "uses" and "extensions" shapes.

Indicate the usage relationship between two use cases, indicate the extension relationship between two use cases

7. Double-click any shape (except the System Boundary shape) to open its UML Properties dialog box, where you can add names, properties, actions, and other properties.

8. Save the chart.

Thank you for reading this article carefully. I hope that the article "How to use Visio to draw UML use case diagrams" shared by Xiaobian will be helpful to everyone. At the same time, I hope that everyone will support you more and pay attention to the industry information channel. More relevant knowledge is waiting for you to learn!

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