They are an effective tool for general functionality analysis without the need to get into the specifics of how those functionalities are implemented on a technical level. Use case diagrams are one of the least technical UML diagram types, so they are a great way to communicate high-level concepts about a system to managers or other business stakeholders. For this reason, use case diagrams are often accompanied in documentation with other technical diagram types, like sequence diagrams or activity diagrams. By visualizing all of the possible actions taken between a system and an external actor, use case diagrams are helpful for system planning and communication.ĭifferent from many other types of UML diagrams, use case diagrams do not show events as they occur in time order and are instead a more broad overview of the system. Use case diagrams are a type of UML diagram that summarize the details of a system’s function by depicting outside users’ interactions with it.
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