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This article introduces Visio to draw UML use case diagram how to achieve, the content is very detailed, interested friends can refer to, hope to be helpful to you.

Brief introduction of UML use case Diagram

First of all, let's take a look at the concept of UML use case diagram, which is mainly used to illustrate the main event flow of the system. It is mainly used to describe the needs of customers, that is, the actions that users want the system to have to complete certain functions, and generally understand that the use case is the functional module of the software, so it is the starting point of the analysis stage of the design system. Designers create and interpret use case diagrams according to customer requirements. It is used to describe which functional modules the software should have and the calling relationship between these modules. use case diagrams contain use cases and actors. Use cases are connected to reflect the whole structure and function of the system to non-technical personnel (usually users of the software), corresponding to the structural and functional decomposition of the software.

A use case is a behavior visible from outside the system, which is a complete service provided by the system to one or more Actor. In principle, use cases are independent and juxtaposed, and there is no inclusion dependency between them. However, in order to reflect the business relationships between some use cases and improve maintainability and consistency, use cases can be abstracted into include, extend and generalization relationships.

Visio steps to draw UML use case diagrams:

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

two。 In the tree view, right-click the package or subsystem that you want to include the use case diagram, point to New, and then click use case Diagram.

A blank page appears, and the UML use case mold appears at the top. The workspace displays the use case as a watermark. The tree view adds an icon that represents the chart.

Note if you cannot see the tree view, point to View on the UML menu, and then click Model Explorer.

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

Use system boundary shapes

Indicate the system boundary in the use case diagram

When 4.Visio draws a UML use case diagram, drag the use case shape from the use case mold and drop it within the system boundary, and then drag the actor shape outside the system boundary.

Use use case shapes

Use participant shapes

5. Use the Communication shape to indicate the relationship between the use case and the actor.

Use communication shapes

Indicate the relationship between the actor and the use case

6.Visio needs to indicate the relationship between use cases through "use" and "extension" shapes when drawing UML use case diagrams.

Point out the usage relationship between the two use cases and the extended relationship between the 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.

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