NMSK II Pediatric Outcome Measures Practice Test

Intra-rater reliability is about one person rating or scoring the same performance consistently across multiple occasions. If the same rater evaluates the same performance on two different days and the scores are essentially the same, it shows that the rater is stable and dependable over time, minimizing scoring drift or bias. Think of it as the score reflecting the performer, not the rater changing their mind. In contrast, having two different raters score the same performance tests inter-rater reliability, where agreement between raters is examined. When a test gives the same result across different days regardless of who uses it, that’s about test-retest reliability—the stability of the measure over time, not the consistency of a single rater. And if a measure relates to another measure, that’s about validity, not reliability.