Use Step Assessment Criteria
| Assessment | Definition |
|---|---|
| Successful with No Issues (S) | The participant was able to complete the task successfully per the evaluation criteria. |
| Use Event | Participant action or lack of action did not meet the evaluation criteria for the task. Use events were classified as either I or R. |
| Incomplete/Incorrect (I) | The participant did not complete the task as intended. |
| Resolved (R) | The participant struggled, described difficulty, or encountered a close call such as taking or describing some action that would have otherwise resulted in incomplete/incorrect use. The resolved use events were assigned to either OD or CC upon root cause analysis. |
| Operational Difficulty (OD) | The participant was able to complete the task safely and effectively but had significant hesitation or challenges while completing the task. |
| Close Call (CC) | The participant had difficulty or took an action that could have resulted in harm but took additional action to recover and prevent the potential harm from occurring (i.e., “near miss”). |
| Study Artifact (SA) | The participant experienced a use error in the simulated use study that would not occur in real practice. Study artifacts were removed from overall task performance totals and summarized separately. |
| Not Assessed (NA) | The participant was unable to complete the task because of a previous usability issue that rendered it impossible to perform the task. Performance that was scored as not assessed was removed from overall task performance totals and summarized separately. |