Use case diagrams consist of systems, actors, use cases, and relationships. Systems represent websites, software components, or business processes. Actors are individuals or organizations that interact with the system, such as primary actors who have goals fulfilled by the system or supporting actors who provide services. Use cases are text stories describing an actor using the system to meet goals, usually named in a verb-object format. Relationships include association, include, extend, and generalization.

1. Use case diagrams
Presented by
Ms.G.Sakthi Priya

2. Use Case diagram consists of
• System
• Actor
• Use Case
• Relationship (Association, Include, Extend, Generalization)

3. Systems
• Website
• Software component
• Business process
• Application
• Etc
Banking App

4. • An actor is specific individual or specific organization, Eg: a
cashier
Three kinds of Actor
1. Primary actor
-has user goals fulfilled through using services of the System.
-For example, the cashier.
2. Supporting actor
-provides a service to the System.
-The automated payment authorization service is an example.
3. Offstage actor
-has an interest in the behavior of the use case, but is not primary or
supporting;
-for example, a government tax agency.

6. USE CASE
• Use cases are text stories of some actor using a system to meet goals
Naming use cases:
• Must be a complete process from the viewpoint of the end user
• Usually in verb-object form like “Buy Pizza”
• Use enough detail to make it specific
• Use active voice, not passive voice
• From viewpoint of the actor, not the system

7. Example for Banking App:
• LogIn
• Check Balance
• Transfer Funds
• Make Payment

9. Relationship
• Association
• Include
• Extend
• Generalization

10. Association