Reliability in testing refers to what?

• A. Consistency of a test
• B. Content validity
• C. Test difficulty
• D. Predictive accuracy

Answer: (A)

Reliability means consistency in measurement. A test is reliable when it yields stable scores across occasions, forms, and scorers. In practice, that means if a student takes the same test again under similar conditions, the scores should be similar, or if different people score the test, their scores align. This focus on stability is what reliability assesses. It’s possible for a test to be reliable but not valid, meaning it produces consistent results that don’t necessarily measure the intended construct. The other ideas describe different qualities: content validity is about whether the test covers the right material; test difficulty concerns how hard the items are; predictive accuracy looks at how well the scores forecast future performance.