UML Use Case Diagram: Definition, Application, and Templates

Last updated on March 19, 2021 by

A Use case diagram is part of the Unified modeling language, and is used by developers to see the interaction between the end users of their program and their system. To put more simply, we can say that this type of diagram is the blueprint of the entire interaction between the user and a specific system. There are many elements involved when making this diagram, and that is what we will talk about in the succeeding parts of this post.

UML Use Case Diagram Tutorial

What is Use Case Diagram?

First of all, let’s get to know what a UML use case diagram is really all about. As mentioned above, the goal of this diagram is to visualize the process of interaction between users and a system. It can change depending on the use case per individual, and provides valuable information to the developers. Using this diagram, they can see if the system is working a it should, or if it needs additional improvements. Additionally, use case diagrams are proven to be effective in explaining complex situations to stakeholders, who don’t have any technical background in software development.

Use case Diagram Symbols

A good diagram is one that doesn’t lack any symbols which can lead to inaccurate data. That is why it is important to familiarize oneself with the different symbols that commonly appear in a specialized diagram like this one. That is why we listed the most common use case diagram symbols that you will encounter when reading one.

  • System Box – This symbol must never disappear from your diagram because it contains the name of the system that you are assessing.
system box use case diagram
  • Actor – This can be represented by a male or female stick figure. It stands for the users who interacts with the system.
actor use case diagram symbol
  • Relationship – These are lines or arrows that connects the Actors to the System and shows how they are related. This determines the flow of the use case and is key in finding out useful data.
relationship use case diagram symbol

Case Diagram Sample Templates

Using a template is one of the easiest way to execute a UML Use case diagram. This is because it doesn’t involve the actual creation process, and only requires you to fill in the necessary information. On that note, here are some templates that you can immediately use with read-made topics just in case you need them.

Library Management System

library use case diagram
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The template above shows the framework between the user and the entire library system. It clearly shows the process and results of each use case just as it should happen in real-life.

Hospital Management System

hospital uml use case diagram
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This template uses the Use case diagram symbols to show the hospital management system. The diagram illustrates how the receptionist interacts with various cases and what the succeeding actions should be.

Online Shopping System

online use case diagram symbols
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If you are an avid online shopper, then you are aware of the things that you need to do to order something online. This diagram shows exactly what happens when you place an order online, and the process the system follows for you to get your order delivered to your doorstep.

Software Engineering System

software use case diagram
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Lastly, we have a slightly complicated diagram since it involves software engineering. There are many variables in software engineering and this is where the use of use case diagram is important. Developers need to test their system if it follows every thing according to the program. That is why they need to use this type of chart, to simplify things for their stakeholders and users.


Starting and maintaining a system needs a solid plan. That is why being prepared for anything that can happen is a prerequisite. On that note, if you are a developer and want to test your system if it follows every protocol, then you need to map out your system. To do so, you’ll need to test it using every possible use case and map it out in a UML use case diagram.

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Posted by: on to Tips and Resources. Last updated on March 19, 2021

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  • These templates are all detailed, that it makes me wonder how long it will take me to actually make one. Thanks for providing me and others with these templates.