Use case diagram
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|UML diagram types|
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|Behavioral UML diagrams|
A use case diagram at its simplest is a representation of a user's interaction with the system that shows the relationship between the user and the different use cases in which the user is involved. A use case diagram can identify the different types of users of a system and the different use cases and will often be accompanied by other types of diagrams as well. The use cases are represented by either circles or ellipses.
While a use case itself might drill into a lot of detail about every possibility, a use-case diagram can help provide a higher-level view of the system. It has been said before that "Use case diagrams are the blueprints for your system".
Due to their simplistic nature, use case diagrams can be a good communication tool for stakeholders. The drawings attempt to mimic the real world and provide a view for the stakeholder to understand how the system is going to be designed. Siau and Lee conducted research to determine if there was a valid situation for use case diagrams at all or if they were unnecessary. What was found was that the use case diagrams conveyed the intent of the system in a more simplified manner to stakeholders and that they were "interpreted more completely than class diagrams".
The purpose of use case diagram is to capture the dynamic aspect of a system. Additional diagrams and documentation can be used to provide a complete functional and technical view of the system.They provide the simplified and graphical representation of what the system must actually do.
- Agile software development
- Business case
- Fundamental modeling concepts
- Object Process Methodology
- Unified Modeling Language
- User story
- McLaughlin et al, 2006, page 297
- Siau & Lee, 2004, page 234
- Gemino, A., Parker, D.(2009) "Use case diagrams in support of use case modeling: Deriving understanding from the picture", Journal of Database Management, 20(1), 1-24.
- Jacobson, I., Christerson M., Jonsson P., Övergaard G., (1992). Object-Oriented Software Engineering - A Use Case Driven Approach, Addison-Wesley.
- Kawabata, R., Kasah, K. (2007). "Systems Analysis for Collaborative System by Use Case Diagram", Journal of Integrated Design & Process Science, 11(1), 13-27.
- McLaughlin, B., Pollice, G., West, D. (2006). Head First Object Oriented Analysis and Design, O'Reilly Media, Inc.