Use Case Diagram

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 ...