| Quality scenario part | Use case part | Comments |
| Environment (context) | Pre-conditions | The configuration, or situation, under which certain stimuli may occur |
| Stimulus Source | A primary actor | |
| Stimulus | Trigger | The trigger is caused by a primary actor which initiates a Main Success Scenario (MSS) |
| Response | The MSS following the trigger, and any sub-scenarios branching from it | |
| Response measurement | Post-conditions | Satisfying the post conditions means success. It can be tuned more quantitatively, by specifying an explicit degree of post-condition satisfaction. |