Reliability focuses on the stability and consistency of measurement. If a test is administered to the same group on two occasions without major changes in conditions, similar scores should be obtained. High reliability means that random error is low and observed scores largely reflect true differences among individuals. This property is fundamental for trustworthy measurement.
Option A:
Option A describes validity, which concerns whether the test measures the intended construct. Although related, validity and reliability are conceptually distinct.
Option B:
Option B is correct because it emphasizes consistency of scores across time or equivalent forms. Techniques such as test–retest and internal consistency estimates are used to evaluate this aspect.
Option C:
Option C refers to criterion related validity, particularly predictive validity, which is about forecasting future outcomes, not about consistency of scores.
Option D:
Option D mentions face validity, which is about appearance of relevance but does not guarantee consistent measurement.
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