1. University of South Carolina
The Process for Software Development Using Use-Cases, Classes, and Sequence Diagrams
Summer Research Experience for Undergraduates in Multidisciplinary Computing
University of South Carolina
LaShea Johnson
Benedict College
Columbia, SC
Computer Science & Engineering
University of South Carolina #

2. Objectives Model structures and behavior of a system
Plan development process
Apply to building a computer game on a cell phone

3. Unified Modeling Language (UML)
Gives pictorial representation of system
Three primary models
Use-Case: Outside view of system structure
Class diagram: Inside view of system components
Sequence diagram: System behavior

4. What are Use-Cases?
Use-Case diagrams serve to identify functions that a system provides
Describe external entities that interact with the system
Describes normal flow of events and describes what can go wrong
Set of scenarios which describe the interactions

5. Use-Case Diagram: Ladybuggin’
Start
Game
Player
Exit
Game
Play
Game
Server

6. Subsets in the Use-Case
Download
Game
Start
Game
Direct
Ladybug
Collect
Seeds
Restart
Player
Play
Game
Server
Exit
Game
Plant
Seeds
Finish
Game
Pause
Credits

7. Storyboards
Describe user scenarios
What happens as game unfolds

8. Ladybug turns right

9. Discovers seed

10. Seed turns into flower

11. Ladybug exits maze

12. Normal Flows and Exceptions
Normal Flow of Events ( All goes well)
User calls for start game
Game downloaded
Exceptions ( What can go wrong)
Server is down
Out of service area

13. Class Diagram Provides a representation of the class
Shows system components
Name - identifies the class
Attributes - information contained in class
Operations - what class can do
Shows relationships between components

14. Classes Driver User Interface Maze Character Seed includes * 1 1 1 1 1 1
includes 1 *
Character
Seed

15. Class Details Maze char [ ][ ] name; int name; boolean name;
void maze( )
void display maze( )
void close maze( )
void update maze( )

16. Sequence Diagram Made up of objects and messages
Shows the dynamics of how objects interact with each other and how these interactions occur over time

17. Start Game DRIVER UI MAZE CHAR SEED SCORE Start Button Game Screen
Display
Screen
New Maze
Display
character
Display seed
Initialize score
Display
maze
Screen

18. Benefits
Provides pictorial representation that is easy for both developers and users to understand.
Improves team productivity
Documents and describes what users want and need
Shows how system will work

19. Conclusions Expedite development process
Gives clear requirements of what is needed
Shows functions for each class
Illustrates how functions interact with each other

20. Acknowledgements Dr. John Bowles, University of South Carolina
Dr. Caroline Eastman, University of South Carolina
Mentor: Tiffany Mintz
Group Members: Carlos Rivera
Lalique Gumbs-Prince
Rob Jansen
Supported by the National Science Foundation under grant #

21. Questions?