(a) Face validity refers to the extent to which a measure appears on the surface to measure what it is suppose to measure. Face validity (sometimes called surface validity) is probably the most commonly discussed type of validity.
(b) Criterion validity is a way of assessing validity by comparing the results with another measure. For example, we could compare the results of an IQ test with school results. If the other measure is roughly compared at the same time we call this concurrent validity. If the other measure is compared at a much later time we call this predictive validity.
(c) Construct validity is a way of assessing validity by investigating if the measure really is measuring the theoretical construct it is suppose to be. For example, many theories of intelligence see intelligence as comprising a number of different skills and therefore to have construct validity an IQ test would have to test these different skills.
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