Usage¶
Actor: An abstraction of users or other systems that interact with the target system
Use Case: A pattern for interaction between the system and actors in the application domain
Involve the user, by presenting use cases through prototypes.
To illustrate relations between actors and use-cases you can use either action table or use case diagrams. UML recommends use-case diagrams, while the book prefers actor table (because of space).
Actor table example for automatic payment system:
Find Actors and Use Cases¶
How will it be used?
If several roles appear the same to the system, consider consolidating them into one.
Actor Specifications¶
The target system’s actors described in specifications.
Consists of 3 parts: goal, characteristics, and examples.
Describes (as precisely as possible) the actor’s role in relation to the target system.
Example from automatic payment system
Use Case Specification | Statechart Diagram¶
Use case specification is more detailed than statechart diagram - Should not contain unnecessary details thought!
Use case specification example from automatic payment system:
Statechart diagram example from automatic payment system:
