![]() They document the interaction between an actor and the system. Use case diagrams each describe an overarching objective and contain descriptions of the various actions that the system must perform to achieve this objective. Unified Modelling Language (UML) is the notation most commonly used in use case diagrams. ![]() If you use a text-based description there is potential for somebody reading it to interpret your message differently which could cause problems in the delivery of the chosen solution. Use case diagrams use a specific notation, which ensures that there is no ambiguity in what you’re trying to convey. A function may be described using the verb/noun rule, such as ‘record customer’. A function may be defined as a set of actions that the business users want the IT system to support in order to achieve a specific goal.įor example, the use case diagram may provide a depiction of a customer account system with the various functions that the business users want the system to support in order to achieve a specific goal. Use case diagrams are used to depict the functions of a system and the actors involved in using those functions. A use case diagram can be used to show the top-level view of a business system and are used to show the things that need to be provided at an organisational, business system or IT system level.
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