Courses/Computer Science/CPSC 203/CPSC 203 Template/Labs Template/Week 1 - Lab 1

Introduction

Today's tutorial introduces to use case diagrams. The following material is contributed by TA Dina Said.

References

Igor Ivković. UML Tutorial Part 1: UML Use Cases.

http://courses.softlab.ntua.gr/softeng/Tutorials/UML-Use-Cases.pdf

Why UML (Unified Modeling Language) Use Case?

1. A description of sequences of actions performed by a given system to produce a result for an actor
2. Use cases specify the expected behavior [what], and not the exact method of making it happen [how]

Components of the Use Case Diagram

1) Actors

• An actor specifies a role that some external entity adopts when interacting with the system directly.
• It may represent a role played by:
  • a user
  • another system
  • a piece of hardware
• Actors may be both at input and output ends of a use case

2)Use Case

• Describes all the services required or performed by the actor.

Problem Statment 1

Problem Statment 2