Use case behaviors may be described in a natural language text (opaque behavior), which is current common practice, or by using UML behavior diagrams for specific behaviors such as activity, state machine, interaction. 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. These are represented by stick figures. Use Case Diagram. Describe Use Case Behaviors. Various actors in the below use case diagram are: User and System. Login Any users can login only if they have already registered. Depending on the project you’re working on, use case development can take up a lot of time and research. Drag it onto the diagram to create an actor and name it Customer. How to create use cases. There are likely a number of use cases you want to analyze, and there’s a lot of thought and planning that goes into each one. Apart from use case diagrams, other UML variants can also be created using it. Use Case diagrams can be used to show how the Use Case are related to other elements in the system, including up-stream elements such as Requirements and down-stream elements such as Components. Step-by-step Guide to Creating a Use Case top Tools to Create a Use Case top. How to create use case diagram in WhiteStarUML. You can draw it on paper or a whiteboard or create it in Microsoft Visio or Microsoft Word (it doesn’t matter). You can create a UML use case diagram in Visio to summarize how users (or actors) interact with a system, such as a software application.An actor can be a person, an organization, or another system. It would help us to understand the role of various actors in our project. Use case diagram can be imagined as a black box where only the input, output, and the function of the black box is known. A use case is not the place to show your creativity – it needs to be meticulously researched and detailed. Keep "Blank" selected and click Next. This high level design is refined again and again to get a complete and practical picture of the system. The Use Case diagram (as for any diagram) can be viewed as an Element List, which makes working with the element's properties easier. Use case diagrams show the expected behavior of the system. These diagrams are used at a very high level of design. UML tools should allow linking behaviors to the described use case. The use case diagram is possibly the easiest diagram to create, so the design process doesn’t take much: Draw the automation boundary in the middle of the workspace. To create a Use Case Diagram, select Diagram > New from the toolbar. Below is a sample use case diagram which I have prepared for reference purpose for a sample project (much like Facebook). It also needs to be simple. In the New Diagram window, select Use Case Diagram and click Next. There are several tools that can be used to develop UML diagrams. WhiteStarUML is a free and feature-rich use case diagram maker software for Windows. A good use case will also contain a diagram, which helps the reader understand what is going on. USE case explanation: Register Any users can create an account by registering. When writing a use case, ensure that you include everything that is involved in the action and nothing else. Create a use case diagram with draw.io. This is a use case diagram for creating a use case diagram. Enter System Use Cases as diagram name and click OK. Press on Actor in the diagram toolbar. Only the use cases contained within that boundary box are considered to be in-scope, and anything outside is considered out-of-scope. USE CASE DIAGRAM. The system will validate the user name and password and will reject them if either they are missing or if the user name is already taken. In use case diagrams there are external actors (which may be users or processes that interact with your system).