Use Case Diagram

About

A Use Case Diagram represents high-level system functionality and the interactions between actors (users or systems) and use cases (functionalities). It helps in understanding user requirements and system scope.

Refer to the official documentation for more details - https://plantuml.com/use-case-diagram

Key Elements

1. Actors

   • External entities (users, systems) that interact with the system.

   • Represented as stick figures.

2. Use Cases

   • System functionalities represented as ovals.

   • Describes what the system does, not how.

3. Relationships

   • Association (solid line) – Connects actors and use cases.

   • Include (<<include>>) – Reusable functionality between use cases.

   • Extend (<<extend>>) – Optional or conditional behavior.

4. System Boundary

   • A rectangle that encloses all use cases within a system.

1. Online Shopping System

This diagram represents an Online Shopping System with different actors and use cases.

• Actors (actor): Represent Customer and Admin.

• Use Cases ((UseCase)): Define system functionalities.

• Relationships:

  • Direct association (-->)

  • Include (-->): Place Order includes Make Payment.

  • Extend (-->): Apply Discount is optional.

@startuml
title Online Shopping System - Use Case Diagram

actor Customer
actor Admin

rectangle "Online Shopping System" {
    Customer --> (Browse Items)
    Customer --> (Add to Cart)
    Customer --> (Place Order)
    (Place Order) --> (Make Payment) : includes
    (Place Order) --> (Apply Discount) : extends
    (Make Payment) --> (Send Payment Confirmation)

    Admin --> (Manage Products)
    Admin --> (View Reports)
}

@enduml