Test-Retest Reliability assesses the stability of scores over time when participants answer the same items on separate occasions.

Test-Retest Reliability assesses the stability of scores over time when participants answer the same items on separate occasions.

• A. Inter-Rater Reliability
• B. Parallel Forms Reliability
• C. Test-Retest Reliability
• D. Internal Consistency Reliability

Answer: (C)

Assessing stability of scores across time with the same items on separate occasions is what test-retest reliability measures. This type of reliability asks: if the same people take the exact same test more than once, will their scores be similar enough to indicate the measure produces consistent results over time? It’s most appropriate when you’re evaluating a trait or attribute expected to remain relatively stable across the interval between tests, assuming the testing conditions are similar and no real change in the construct occurred. The idea is that any large differences would suggest the test isn’t yielding consistent results over time, rather than reflecting actual change in the construct.

By contrast, inter-rater reliability looks at whether different scorers rate or score items in the same way, not whether scores stay the same over time. Parallel forms reliability examines consistency across different versions of a test that are intended to be equivalent, often administered at the same time or under similar conditions. Internal consistency reliability focuses on how well the items within a single administration work together to measure the same underlying construct, not on stability across occasions.