In what scenario would inter-rater reliability NOT be relevant?

Inter-rater reliability pertains to the degree of agreement among different raters evaluating the same performance. It is a measure used to ensure that assessments are consistent when multiple observers are involved.

In the scenario involving a single rater, inter-rater reliability does not apply because there is no other rater to compare results with. Since the assessments are not being compared to an additional perspective, the consistency or agreement of ratings by more than one rater, which is the essence of inter-rater reliability, is moot. This means that the focus in that situation is solely on the individual rater's judgment rather than the reliability of multiple raters' evaluations.

In contrast, the other scenarios involve situations where the evaluations would benefit from assessing the consistency of different raters and, therefore, inter-rater reliability would be relevant. For example, when multiple raters assess the same performance, differences among their ratings would highlight the need for inter-rater reliability to ensure that the assessment is standardized across raters.