If a practitioner gives a math test to a group of participants at two points in time, and finds that the high scorers on the first test are also the high scorers on the second test, the test has demonstrated:

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Test-retest reliability refers to the consistency of a measure over time, and is evaluated by administering the same test to the same group of participants at two different points in time, and then correlating the scores from the two administrations. If the high scorers on the first test are also the high scorers on the second test, then this indicates that the measure is consistent over time and has good test-retest reliability. It is not necessarily an indication of content validity (which refers to whether the test measures what it is supposed to measure), interrater reliability (which refers to the consistency of ratings across multiple raters), or internal consistency (which refers to the consistency of items within a single test).

If a Practitioner Gives a Math Test to a Group