Use Cases & Use Case Diagrams

Summary

A use case describes a specific interaction between a user (actor) and a system to achieve a goal, often visualized in a use case diagram — a traditional, more structured alternative to Agile user stories.

• 1Write a detailed use case for a common system interaction, including alternate flows.
• 2Sketch a simple use case diagram showing actors and their interactions with a system.
• 3Compare use cases to user stories and note when each format fits better.