The "test-retest" method is a way to measure the reliability of a test or assessment. It involves giving the same test to the same group of people at two different times. By comparing the results, researchers can determine how consistent the test is over time. This method is commonly used in fields like psychology and education to ensure that a test accurately measures what it is intended to measure. If the scores are similar on both occasions, it indicates that the test is reliable and can be trusted to produce stable results.