Concurrent validity is a type of validity that assesses how well a new test correlates with an established test measuring the same construct. It helps determine if the new test produces results similar to those of a reliable benchmark, indicating that it is measuring what it is intended to measure. To evaluate concurrent validity, researchers administer both the new test and the established test to the same group of participants at the same time. A strong correlation between the two sets of results suggests that the new test is valid and can be used confidently in similar contexts.