The extent to which a measure yields the same scores across different times, groups of people, or versions of the instrument is called

The extent to which a measure gives the same scores across times, groups, or versions of the instrument is reliability.

Reliability is about consistency and reproducibility of measurement.

Content validity asks whether items cover the full domain of the concept, a validity issue.

Construct validity asks whether the measure taps the intended theoretical construct.

Predictive validity asks whether scores forecast a future criterion.

Reliability is necessary but not sufficient for validity.