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UML is the modeling toolkit that you can use to build your diagrams.Use cases are represented with a labeled oval shape.UML use case diagrams are ideal for: This use case diagram is a visual representation of the process required to write and publish a book.
The figure below shows an ATM use case diagram example, which is quite a classic example to use in teaching use case diagram.
The Document Management System (DMS) use case diagram example below shows the actors and use cases of the system.
With attractive color schemes, text that’s easy to read and edit, and a wide-ranging UML shape library, you’re ready to go! Consider this example: A man with a chainsaw interacts with the environment around him.
Depending on the situation and the context of the situation, he might fall into one of many different use cases. Is there anything ominous about the way he is wielding his chainsaw?
You can also: relationship is after you have completed the first cut description of all your main Use Cases.
You can now look at the Use Cases and identify common sequences of user-system interaction.
An extending use case is, effectively, an alternate course of the base use case.
The use case accomplishes this by conceptually inserting additional action sequences into the base use-case sequence. It can not be instantiated, as it contains incomplete information.
The system boundary defines the system of interest in relation to the world around it.
Note that: to make use case approach more "Agile", do not detail all use cases, but prioritize them in your product backlog, you should refine the use case in different level of details according to the development phase with just-in-time and just-enough manner.