Represents a role played by an external user or another system.
By centering the entire development life cycle—from requirements to testing—around these use cases, Jacobson ensured that the resulting software actually met the needs of its users. Key Concepts and Models in OOSE Represents a role played by an external user
Long-lived information (e.g., a "Customer" record). Interface Objects: How the actor interacts with the system. Represents a role played by an external user