When assessing the reliability of a measure, one might be interested in knowing how scores on the measure at one time relate to scores on the same measure at another time. This is called

Test-retest reliability

Explanation:

Test-retest reliability is a term in a research that describes the measure of reliability obtained by the researcher, after the same test was carried out twice under the same conditions of measurement, over a period of time to a group of individuals.

The purpose of carrying out test-retest reliability is to ascertain the  internal validity of a test and ensures that the measurements obtained in the research study are both representative and stable over time.

For example, test on a Thursday morning, then the same test is carried out again the following Thursday morning under same conditions

Hence, TEST-RETEST RELIABILITY involves a process that when assessing the reliability of a measure, one might be interested in knowing how scores on the measure at one time relate to scores on the same measure at another time