Ideally, a Use Case documentation contains all the interactions between your user and the system. Consequently, such documentation needs to be iterated throughout the whole UX design process (especially after testing). Usually a Use Case consist of the following parts:
- Title and short Summary
- Trigger Event
- The user, who interacts with the system
- The Main Success Scenario (Standard Flow)
- Alternate Flows and Exception Flows
It needs to be highlighted, that next to Use Cases, User Stories and Scenarios should be used in order to ensure a human-centered approach. While Use Cases are more like technical blueprints, User Stories and Scenarios represent the human touch of this phase of the UX design process.