validity, convergent

n. Convergent validity, a type of construct validity, is the extent to which one measure of a construct correlates with other measures of the same construct. For example, a researcher examining the validity of a short-form test of intelligence would want to examine the correlation between scores obtained from the short-form intelligence test and scores from established, accepted intelligence tests (such as the Wechsler or Stanford-Binet series). The convergence of scores from various tests attempting to measure the same theoretical construct provides evidence of convergent validity. – BJM