Use Cases Diagrams

Use Cases Diagrams

1. System

   • Contains arrangement of multiple cases
   • Represented using a rectangle

2. Case

   • Has an actor
   • Represented using ellipses
   • Extensions
     • Additional steps
       • Base Case
   • Exceptions
     • Things that can go wrong
   • Invoking
   • Included
   • Happy path
     • When nothing goes wrong

3. Actor

   • Has a goal in the system
   • Primary
     • Start of system
   • Secondary
     • Acts on specific case
   • Represented using stick figures