Which concept describes the reproducibility of a test's results?

• A. Reliability
• B. Validity
• C. Specificity
• D. Accuracy

Answer: (A)

Reliability describes how reproducible or consistent a test’s results are across repeated measurements, different testers, or different occasions. If you administer a test under similar conditions and get very similar scores each time, the test has high reliability (for example, a fitness test giving nearly identical times on multiple trials). This consistency is necessary for the results to be trustworthy. It’s important to distinguish this from validity, which asks whether the test actually measures what it’s intended to measure; you can have reliable results that are not valid if they consistently reflect something other than the target attribute. Specificity and accuracy relate to different concepts (diagnostic performance and closeness to the true value, respectively) and don’t capture the idea of repeated consistency in the same way reliability does.