1. Systems Analysis and Design in a Changing World, 6th Edition
Chapter 5
Systems Analysis and Design in a Changing World, 6th Edition

2. Extending the Requirements Models
Chapter 5
Systems Analysis and Design in a Changing World 6th Ed
Satzinger, Jackson & Burd

3. Systems Analysis and Design in a Changing World, 6th Edition
Chapter 5 Outline
Use Case Descriptions
Activity Diagrams for Use Cases
The System Sequence Diagram—Identifying Inputs and Outputs
The State Machine Diagram—Identifying Object Behavior
Integrating Requirements Models
Systems Analysis and Design in a Changing World, 6th Edition

4. Systems Analysis and Design in a Changing World, 6th Edition
Overview
Chapter 3: Modelling use cases (Processes)
Chapter 4: Modelling classes (data)
Chapter 5: Modelling use cases, in more detail
including actors
Stakeholders
scenarios
Preconditions
post conditions
the flow of activities
Exceptions
etc
Systems Analysis and Design in a Changing World, 6th Edition

5. Systems Analysis and Design in a Changing World, 6th Edition
Use Case Descriptions
Brief use case description
Good initially, or for simple cases
Systems Analysis and Design in a Changing World, 6th Edition

6. Fully Developed Use Case Description Use case: Create customer account
Systems Analysis and Design in a Changing World, 6th Edition

7. Fully Developed Use Case Description Create customer account (part 1 )
Systems Analysis and Design in a Changing World, 6th Edition

8. Fully Developed Use Case Description Create customer account (part 2 )
Systems Analysis and Design in a Changing World, 6th Edition

9. Systems Analysis and Design in a Changing World, 6th Edition
Another Fully Developed Use Case Description Example Use case Ship items
Systems Analysis and Design in a Changing World, 6th Edition

10. Fully Developed Use Case Description Ship items (part 1 )
Systems Analysis and Design in a Changing World, 6th Edition

11. Fully Developed Use Case Description Ship items (part 2 )
Systems Analysis and Design in a Changing World, 6th Edition

12. Systems Analysis and Design in a Changing World, 6th Edition
UML Activity Diagram for Use Case Create Customer Account Note: this shows flow of activities only
Systems Analysis and Design in a Changing World, 6th Edition

13. Systems Analysis and Design in a Changing World, 6th Edition
UML Activity Diagram for Use Case Fill shopping cart Note: this shows use case with <<includes>> reltionship
Systems Analysis and Design in a Changing World, 6th Edition

14. System Sequence Diagram (SSD) Notation
Systems Analysis and Design in a Changing World, 6th Edition

15. SSD Message Examples with Loop Frame
Systems Analysis and Design in a Changing World, 6th Edition

16. SSD Message Examples Opt Frame (optional) Alt Frame (if-else)
Systems Analysis and Design in a Changing World, 6th Edition

17. Systems Analysis and Design in a Changing World, 6th Edition
Message Notation
Systems Analysis and Design in a Changing World, 6th Edition

18. SSD for Create customer account Use case
Systems Analysis and Design in a Changing World, 6th Edition

19. SSD for Ship items Use Case
Systems Analysis and Design in a Changing World, 6th Edition

20. Systems Analysis and Design in a Changing World, 6th Edition
State Machine Diagram
State machine diagram
A UML diagram showing the life of an object in states and transitions
State
A condition during an object’s life when it satisfies some criterion, performs some action, or waits for an event
Transition
The movement of an object from one state to another state
Action Expression
A description of activities performed as part of a transition
Systems Analysis and Design in a Changing World, 6th Edition

21. State Machine Diagram (continued)
Pseudo state
The starting point of a state machine diagram (black dot)
Origin state
The original state of an object before transition
Destination state
The state to which the object moves after the transition
Guard condition
A true false test to see whether a transition can fire
Systems Analysis and Design in a Changing World, 6th Edition

22. State Machine Diagram for a Printer
Systems Analysis and Design in a Changing World, 6th Edition

23. Systems Analysis and Design in a Changing World, 6th Edition
Composite States
State containing other states and transitions
Printer can be On and either Idle or Working
Systems Analysis and Design in a Changing World, 6th Edition

24. Systems Analysis and Design in a Changing World, 6th Edition
Concurrent Paths
Multiple paths in composite state
Printer On paths are independent
Systems Analysis and Design in a Changing World, 6th Edition

25. Steps for Developing State Machine Diagram
Review the class diagram and select classes that might require state machine diagrams
For each class, make a list of status conditions (states) you can identify
Begin building diagram fragments by identifying transitions that cause an object to leave the identified state
Sequence these states in the correct order and aggregate combinations into larger fragments
Review paths and look for independent, concurrent paths
Systems Analysis and Design in a Changing World, 6th Edition

26. Steps for Developing State Machine Diagram (continued)
Look for additional transitions and test both directions
Expand each transition with appropriate message event, guard condition, and action expression
Review and test the state machine diagram for the class
Make sure state are really state for the object in the class
Follow the life cycle of an object coming into existence and being deleted
Be sure the diagram covers all exception condition
Look again for concurrent paths and composite states
Systems Analysis and Design in a Changing World, 6th Edition

27. RMO Domain Class States for SaleItem Object
Systems Analysis and Design in a Changing World, 6th Edition

28. Final State Machine Diagram for SaleItem Object
addItem() and archive() transitions added
markBackOrdered() transition added
Systems Analysis and Design in a Changing World, 6th Edition

29. Initial State Machine Diagram for RMO Sale Object
Systems Analysis and Design in a Changing World, 6th Edition

30. Final State Machine Diagram for Sale Object
Systems Analysis and Design in a Changing World, 6th Edition

31. Integrating Requirements Models
Systems Analysis and Design in a Changing World, 6th Edition

32. Problems and Exercises
1(i and ii), 2, 3
Systems Analysis and Design in a Changing World, 6th Edition