volume_mute
Actors in Use Case Diagrams
publish date: 2026/06/08 06:26:24.349086 UTC
volume_mute
True or False: In a UML use case diagram, actors can only be human users — other systems and hardware devices cannot be represented as actors.
Correct Answer
False
Explanation
Actors can be human users OR other external systems and hardware. The stick figure notation was originally developed to cover human interaction, but it is also used to represent other external systems and hardware. For example, in the Transfer data use case, both the Medical Receptionist (human) and the Patient Record System (another system) are actors.
Reference
Software Engineering, Ian Sommerville, 9th edition