Reliability is an indicator of a measure's internal consistency.

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Reliability is a measure of how consistent or stable a measure is, which refers to the degree to which test scores are consistent across different items or test administrations. Therefore, it indicates the degree to which a measure produces consistent results over time and under different conditions. In other words, a reliable measure should produce similar results if used repeatedly with the same population, under similar conditions.

Reliability Is an Indicator of a Measure's Internal Consistency