A primary use case is a fundamental activity or goal that a primary actor—typically an end user or external system—aims to achieve when interacting with a system. It represents the main purpose or “happy path” for which the system was designed, such as “withdrawing money” from an ATM. Key Characteristics
Actor-Driven: It is initiated by a primary actor who receives direct value from the interaction.
Goal-Oriented: It focuses on completing a standalone task that provides an observable result of value.
Main Success Scenario: It primarily documents the standard, error-free path to success. Primary vs. Secondary Use Cases
While “primary” often refers to the actor, it also distinguishes core functionality from supporting tasks:
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