A relatively new concept in validity suggests that the best criteria for determining a measure's validity is that (a) the quality being measured must exist and (b):

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This concept is known as construct validity, which suggests that the measure should be correlated with a relevant outcome, indicating that the quality being measured actually exists and has an impact on some outcome. Thus, variations in the quality must cause variations in some outcome, which is the best choice. Option B does not necessarily apply to all qualities and option C is not a requirement for construct validity. Option D is related to convergent validity, which is another type of validity.

A Relatively New Concept in Validity Suggests That the Best