Phần Mềm Vẽ Sơ Đồ Use Case, Uml Use Case Diagrams With Draw

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No Result View All Result No Result View All Result Phần Mềm Vẽ Sơ Đồ Use Case, Uml Use Case Diagrams With Draw

Use case diagrams in UML are used during the requirements phase of software development – they usually put the system requirements into a diagram format, and it’s easy to see what actions a system must support at a glance. Of course, there will be many use cases for your system, and therefore you will usually need to draw many use case diagrams!

Along with other UML diagrams, such as activity, sequence and component diagrams, use case diagrams help you to visualize your software and requirements, before jumping in and starting to program.

Đang xem: Phần mềm vẽ sơ đồ use case

Contents

• 0.1 Enable the UML shape library
• 0.2 Create a use case diagram with draw.io
• 1 About the Author: Kymberly Fergusson

Enable the UML shape library

In draw.io, all the shapes you need for use case diagrams are in the UML shape library. Click More Shapes … at the bottom of the left-hand panel, then enable the UML shape library and click Apply.

Create a use case diagram with draw.io

In use case diagrams there are external actors (which may be users or processes that interact with your system). These are represented by stick figures. In the practical example I’ve created for this post as shown below – a habit tracking app – there are two external actors, a user and a coach.

The actions that the actors take and their goals are represented by ovals with a solid arrow pointing to them. Not all actions can be directly done by an actor – some are triggered by other actions (represented by dotted lines, with the arrow indicating which action triggers the other).

Open this diagram in draw.io

Tip: If you have a more complex diagram than in our example, you can group elements of your diagram together using the ‘folder’ shape. You can then create a ‘sub-diagram’ on a second page in your draw.io diagram, and link the shapes/pages together – multiple pages in your diagrams make it easy to keep track of complex systems!

Use case diagrams can show information that makes it easier to program

You can show specific relationships between the actions (or classes and methods) with include and extend.

When one action is dependent on another action, use an include relationship. For example when you Add a comment in the habit tracker app, you must Update the habit history. But you wouldn’t update the habit history without one of the four actions: Add a habit, Delete a habit, Mark a habit as done or Add a comment. So, the Update the habit history action is dependent on the other actions.When one action is an extension of another action (or a more specific version of that action), use extend to show that relationship. In my example, you can Mark a habit as done, or Mark a habit as done AND add a comment in the same action.

You can also show inheritance on both actions and actors with the standard UML notation of a connector with an open arrowhead.

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It’s optional, but sometimes useful to add the standard UML notation for multiplicity: 1, 1..n, or *. If the relationship between the diagram elements is one-to-one, then simply leave it blank.

What other UML diagrams should you create?

Use case diagrams are usually the first type of diagram you would create when designing or redesigning software. They show the main goals of the actors and the general interactions between the use cases.

You can diagram your system in much more detail using:

Activity diagrams to illustrate complex processes that include loops, feedback, choices and parallel actions. Activity diagrams also show the flow of data between the components of your system.Sequence diagrams to show the actual steps that happen for each use case in the order that those steps happen.draw.io integration with Jira and Trello

Keep your diagrams together with your software development tasks. draw.io is available as a Jira app and a Trello Power-Up. You don’t need to tuck your diagrams away on your desktop or on a shared drive – you can keep them right with the issues they refer to, and continue to collaborate on the diagrams in draw.io

Need some help?

Want to hear how others are using draw.io? Read about how Solution Architect, Marcel Grossert, uses draw.io to visualize his workflows!

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About the Author: Kymberly Fergusson

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