Software Engineering Use Cases

Flashcards for Software Engineering Use Cases Lecture

Use Case

Step-by-step description of how a user will use the system-to-be to accomplish business goals

Actors

Environmental agents or actors that will cooperate with the system

Use Case Diagram

Shows relations of the actors and use cases

Use Case Scenarios

Plans for realization of user goals or handling contingencies

Use Case Scenarios or Scripts

Show an envisioned sequence of cooperative interactions between the external actors and the system-to-be

Initiating Actor

Initiates the use case to achieve a goal

Participating Actor

Participates in the use case but does not initiate it

Supporting Actor

Helps the system-to-be to complete the use case

Offstage Actor

Passively participates in the use case, i.e., neither initiates nor helps complete the use case, but may be notified about some aspect of it

<extends> Relationship

Relationships that represent exceptional or seldom invoked cases

<include> Relationship

Relationships that represents behavior that is factored out of the use case for reuse, not because it is an exception

Traceability Matrix

Mapping system requirements to use cases

Purpose of Traceability Matrix

To check that all requirements are covered by the use cases, or that none of the use cases is introduced without a reason

Security and Risk Management

Identifying and preempting the serious risks to system’s safe and successful functioning

System Sequence Diagram

Similar to UML sequence diagrams, but for actor interactions instead of software object interactions