1. Identifying & Creating Use Cases - Part 3
Division of AIDS
Identifying & Creating Use Cases - Part 3
October 1, 2003

2. Agenda Training Plan Overview Review Parts 1 & 2
Use-Cases & Packages
Activity Diagrams
Activity Diagram Description
Activity Diagram Creation Procedures
Adding Detail
Events
Guard Conditions
States
Analysis
Advanced Diagrams
Swimlanes
Object Flows
Next Steps

3. Training Plan Overview
Identifying & Creating Use Cases
Part 1 (Wednesday, September 24)
Part 2 (Friday, September 26)
Part 3 (Today)
Actors and Use Case Diagrams
Detailing Requirements with Requisite Pro (Parts 1 & 2)
Sequence Diagrams
State Transition Diagrams
Collaboration Diagrams
Reports
SoDA

4. Part 1 Review Models Packages – used to organize the models Business
Business Analysis
Use-Case
Analysis
Design
Implementation
Deployment
Packages – used to organize the models
Logical breakdown of model elements
Supports model management

5. Part 1 Review Use Cases Describes activities
One use case is assigned per package
Each Use Case specified by 5 basic types of diagrams, text and …
Use-Case
Activity
State
Sequence
Collaboration

6. Part 1 Review For each package identified Create the Package
Create the package’s use-case – use the same name as the package
Create shells of all use-case-related diagrams
Use analysis techniques to fill in the diagrams

7. Part 2 Review Identifying Use Cases - Analysis Steps Identification
For each identified use case
Create a context and detail activity diagram
Identify potential sub-use cases
Create a new package, use case, and related diagrams for the identified sub-use case
Move relevant activities under the sub-use case
Cleanup and Complete

8. Part 2 Review Organization Packages Views Hierarchy Use-Case View
Logical View
Component View
Deployment View
Hierarchy
Levels of Abstraction

9. Part 2 Review Activity Diagram
Definition: Defines the workflow associated with the use case
How used
Details the actions to be taken and decisions to be made for a use case
Helps identify possible use cases at next level of detail
Types
Regular
With States
With Swimlanes
With Object Flows

10. Part 2 Review Activity Diagram Model Elements Start State End State
Decision
State Transition
Regular
Transition To Self
Horizontal and Vertical Synchronization
Note
Note Anchor
Text
Swimlanes
State

11. Part 3 - Overview Activity Diagrams Use-Case Analysis Swimlanes
Labels
Events
Actions
Stereotypes
Conditional Threads
Guard Conditions
History States
Nested Activities
Transitions to Self
Decision Guards
States
Decision Merges
Use-Case Analysis
Swimlanes
Object Flows

12. Activity Diagrams (AD) Components

13. AD – Decisions & Events
A decision defines a specific location on an activity diagram or statechart diagram where the workflow may branch
1 to n branches
1 to 2 branches normal
Event defines a trigger of a state transition (1 to n)
A decision of ???
Type of event

14. AD – Decisions & Events

15. AD - Events
Add event
Right click transition and select Open Specification
Select General tab.
Enter Event
Click OK

16. AD - Events
Enter Event
Click OK

17. AD – Activity Actions
An action defines a step within an Activity or State
Add Actions
Right click activity
Select Actions tab
Right click and select Insert

18. AD – Activity Actions Specify action Repeat as Necessary
Right click added action
Select When
Select Type
Enter Name
Click OK
Repeat as Necessary

19. AD – Activity Actions

20. AD – Activity Stereotype
A stereotype defines a sub-classification of a model element
Add Stereotype
Right click activity
Select General tab
Select stereotype from drop down or add new type

21. AD – Activity Stereotype
Change Stereotype Display
Right click and select Options, Stereotype Display, Decoration

22. AD – Details

23. AD – Conditional Threads
A conditional thread defines a branch of workflow which only occurs when a set of conditions exist

24. AD – Guard Conditions
A Guard Condition defines a condition which, when true, allows the transition to occur. As long as the condition remains false, the transition will not occur.
Add guard condition
Right click transition and select Open Specification
Select Detail tab.
Enter Guard Condition
Click OK

25. AD – Conditional Threads and Guard Conditions

26. AD – Conditional Threads and Guard Conditions

27. AD – History States
History states allow the state machine to re-enter the last sub-state that was active prior to leaving the composite state.
Add history state
Right click activity and select Open Specification
Select State/Activity History check box.
Select OK

28. AD – History States

29. AD – Nested Activities
Nested Activities are a way to visually present the equivalent of a sub- diagram of activities
Enclosing activity is referred to as a superactivity
Nested activities are called subactivities

30. AD – Nested Activities

31. AD – Transitions to Self
Transitions to Self are a looping mechanism
Drag and Drop Transition to Self tool onto activity
Add guard condition to new transition
Add guard condition to activity completion transition

32. AD – Transitions to Self

33. AD – Decision Guard Conditions
Decision Guards Conditions control the flow of a decision via the transitions from the decision
Boolean logic of True

34. AD – Decision Guards

35. AD – Decision Guards

36. Use-Case View Activities Added State/Models Added
Clean Up
Rename
Other Sub-model elements added

37. AD - States
A state defines a condition of an object in which it performs some activity or waits for an event
Add a state
Drag and drop State tool on to the diagram
Name the state
Connect transitions

38. AD - States

39. AD - States

40. AD - States

41. AD - States

42. Use-Case View
States Added

43. Use-Case View
Review
Reorganize
Complete

44. Use-Case Analysis

45. Use-Case Analysis 3 New Use-Cases Add New Use-Cases Check In Passenger
Verify Reservation
Passenger List
Add New Use-Cases
Follow Process

46. Use-Case Analysis
Rename Verify Reservation to Check In Passenger

47. Use-Case Analysis
Delete Actions

48. Use-Case Analysis

49. Use-Case Analysis

50. Use-Case Analysis

51. Use-Case Analysis

52. Use-Case Analysis

53. Use-Case Analysis

54. Use-Case Analysis

55. AD – Decision Merges
Use decisions to show where the threads merge again

56. AD – Clean Up

57. AD – Clean Up

58. AD – Clean Up

59. AD – Clean Up

60. AD – Clean Up

61. AD – Clean Up

62. Advanced AD - Swimlanes
Swimlanes are similar to an object
Represent organizational units or roles
Allow assignment of activities to the organizational units or roles

63. Advanced AD - Swimlanes

64. Advanced AD - Swimlanes

65. Advanced AD - Swimlanes

66. Advanced AD - Swimlanes

67. Advanced AD - Swimlanes

68. Advanced AD - Swimlanes

69. Advanced AD - Swimlanes

70. Advanced AD - Swimlanes

71. Advanced AD - Swimlanes

72. Advanced AD – Object Flows
Object flows are used to show how business entities are created and used in a workflow
The object flow state represents the state of an object of a class as it participates in the workflow
The same object can be manipulated by a number of successive activities that change the object's state.
The same object can then be displayed multiple times in an activity graph, with each appearance representing a different state during its life.

73. Advanced AD – Object Flows
Create or Select an Activity Diagram
Select the Object tool
Click on diagram to place
Right click new object and select Open Specification

74. Advanced AD – Object Flows
Enter Name
Select <New> form State drop down list
Enter Name for State
Click OK twice
Add Object Flow transitions to and from new object

75. Advanced AD – Object Flows

76. Advanced AD – Object Flows
Re-open specification
Open Class drop down list and select <New>
Class Specification dialog opens
Enter Name
Select a Stereotype

77. Advanced AD – Object Flows

78. Advanced AD – Object Flows

79. Next Steps Homework Classes Ahead DAIDS Model
Explode one top level use-case
Concentrate on abstraction of detail
Use modeling elements
Business Use-Case Model Level
Classes Ahead
Actors and Use Case Diagrams
Detailing Requirements with Requisite Pro (Parts 1 & 2)
Sequence Diagrams
State Transition Diagrams
Collaboration Diagrams
Reports
SoDA