Reliability is defined as what in measurement?

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Reliability is about the stability and repeatability of a measurement. If you administer the same instrument under the same conditions on different occasions, you should get similar results, which is the idea of consistency over time (test-retest reliability) and, more broadly, stable scores across repeated uses. This focus on repeatable results distinguishes reliability from validity, which asks whether the instrument actually measures what it’s intended to measure. Other options touch on accuracy, study power, or how broadly findings apply, but reliability specifically concerns producing consistent measurements across repeated assessments.