| Quality scenario part | Use case part | Comments |
| Environment (context) | While executing the existing use case | |
| Stimulus Source | Internal | |
| Stimulus | A violated condition in the current sequence of actions, which causes the scenario to "skip" to a branch. | |
| Response | Sequence of steps in either an MSS or a branch | The branch may be one of the following: a) An alternative, which leads to successful completion of the use case. This happens when the system managed to prevent the fault from becoming a failure; b) An exception, which describes an attempt of the system to prevent the failure but leads to unsuccessful completion of the use case. |
| Response measurement | Post-conditions | a) An alternative leads to satisfied post-conditions, indicating success b) An exception leads to unsatisfied post-conditions, which indicate failure |