1. Object Interaction Diagrams
CSC 422
Kutztown University
Dr. Spiegel

2. Use Case Diagram Lays out the use cases in a system
Shows actors and the different system actions in which they are participants
Provides an overall picture of the interactions within a system

3. Use Case Diagram

4. Object Interaction Diagrams
Collaboration
Sequence

5. Collaborations What is a collaboration? Properties
An arrangement of objects within a context
Properties
The collaboration is aimed at achieving some goal
Object (possibly) fulfills a predefined role
A single object may fulfill more than one role
Roles are only meaningful within their context
A parameterized collaboration is a pattern
Collaboration diagram
Shows Interaction between the participating objects
Relationships are indicated by arrows (messages, composition, …)
Time is indicated by “sequence number”

6. Validate User (Administrator)

7. Change Password (Administrator)

8. Register Course (Administrator)

9. Drop Course (Administrator)

10. Add Course (Administrator)

11. Remove Courses (Administrator)

12. List Students(Administrator)

13. Student Details (Administrator)

14. Add Account (Administrator)

15. Delete Account (Administrator)

16. View Transcript (Administrator)

17. Sequence Diagrams Describe how groups of objects interact
Shows messages passed between objects over time
Properties
Captures the behavior of a single scenario
Most popular way for representing a use-case
Actually shows the same information as a collaboration diagram
Sequence diagrams (SD) vs. Collaboration Diagrams (CD)
SD: Shows time clearly; object relationships are implicit
CD: Shows object relationships clearly; time has no visual representation

18. Validate User (Administrator)

19. Change Password (Administrator)

20. Register Course (Administrator)

21. Drop Course (Administrator)

22. Add Course (Administrator)

23. Remove Courses (Administrator)

24. List Students (Administrator)

25. Student Details (Administrator)

26. Add Account (Administrator)

27. Delete Account (Administrator)

28. View Transcript (Administrator)