In the context of selection tests, what does reliability describe?

• A. The test measures exactly what the job requires.
• B. The test produces consistent results over time.
• C. The test is biased against certain groups.
• D. The test is quick to administer.

Answer: (B)

Reliability means the scores you get from a selection test are dependable and stable across repeated administrations or different raters. In practice this means if a candidate took the same test again, or if another evaluator scored a constructed response, you would see similar results. It also covers internal consistency—the items within the test work together to measure the same underlying ability, so responses to individual items align with the overall score.

This stability matters because it limits measurement error. When a test is reliable, differences in scores reflect real differences in the underlying construct (like ability or trait) rather than random fluctuation or scoring quirks. That stability is essential for making fair hiring decisions over time.

It’s important to distinguish reliability from validity. A test can be reliable but not valid if it yields consistent results that don’t actually measure the job-related ability. And bias is a separate concern—reliability doesn’t by itself address whether the test is fair across different groups. Finally, the speed of a test doesn’t determine reliability; a quick test can be highly reliable, or not, depending on how consistently it measures what it intends to measure.