Use Case Diagram
Learn about the use case diagram and its benefits with some examples.
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Use case diagram describes the specification of users and their possible interactions with the system. These possible interactions are called use cases.
Components of a use case diagram
To understand a use case diagram, it is important to first understand its components. Use case diagrams have the following components:
Actor: Users are called actors. They interact with the system. They could be humans, machines/hardware, or other external systems. There are two types of actors:
Primary actors: These are the humans or external systems that interact with that system and are responsible for initiating the use case. They are placed on the left side in a use case diagram. Primary actors are also called active actors.
Secondary actors: These are the ones that are used by the ...