1. INFS 6225 Object Oriented Systems Analysis & Design
Chapter 4: Functional Modeling

2. Use-Case Illustrates the activities performed by the users of a system
Depict the Users’ view of a system
Are logical models
Are technology-independent
Can be used to describe current (As Is) or future (To Be) system

3. Use-Case: 2 Parts
Use-Case Descriptions – Written, less formal documents that describe the functions of a system
Use-Case Diagram – Formal, graphical representation of the functions of a system
Use-Case Descriptions are created first; Use-Case Diagrams are then created from Use-Case Descriptions

4. Use-Case Description Use Case Name: ID: Importance Level:
Primary Actor: Use Case Type:
Stakeholders and Interests:
Brief Description:
Trigger:
Relationships: (Association, Include, Extend, Generalization)
Normal Flow of Events:
Subflows:
Alternate/Exceptional Flows:

5. Use-Case Diagram

6. Use-Case Diagram Components

7. More Complex Diagrams

8. Practice Exercises