Which characteristic is evaluated by administering the same test to the same subjects on multiple occasions?

• A. Reliability
• B. External Validity
• C. Internal Validity
• D. Design

Answer: (A)

Reliability is about the consistency of a measurement. When you give the same test to the same people on different occasions, you’re checking whether the scores stay similar if nothing meaningful has changed. This is specifically called test-retest reliability, where a high similarity or correlation between the two administrations indicates the instrument yields stable results over time. External validity is about generalizing findings to other people, places, or times, not about the stability of the measurement itself. Internal validity refers to how well a study isolates the effect of the variable of interest without confounding influences, not about the repeatability of the test scores. Design is the overall plan of a study, not a property of the measurement. In practice, you’d choose an appropriate time interval to minimize practice effects or true change, focusing on whether the test consistently measures the same construct across occasions.