WHAT IS A Use Case Diagram? An illustration of a system’s intended functions (user goals), its surroundings (actors), and relationships between the user goals and actors Unified Modeling Language

EXAMPLE

EXAMPLE

Step 1: Identify System Domain Select an entity as a focal point Draw a box Label the system domain

Step 2: Identify Actors Identify the entities that have direct interaction with the system domain Draw a stick figure for each actor

What is a Primary or Secondary Actor? Primary actors initiate interaction with the System Domain to achieve a goal Who “Knocks”? Secondary actors are called by the System Domain for assistance to achieve the primary actor’s goal Tip: Position Primary Actors on the left side and Secondary Actors on the right side of the System Domain

Step 3: Name user goals Identify WHY an actor would initiate interaction with the System Domain Draw a horizontal ellipse or oval Goal is stated in verb-noun format Example Goals: Search for Account Apply Payment Open New Account Search for Account

Step 4: Connect Actors to Goals Primary actors initiate interaction with the System Domain to achieve a goal Secondary actors are called by the System Domain for assistance to achieve the primary actor’s goal Primary Actor Secondary Actor