Validity Vs. Reliability When One Essay

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Finally, internal consistency reliability looks at items in the same test, to see if they measure the same construct in the same way (Cherry, 2011, Reliability). However, all of these measures of reliability are useless if a test does not measure what it purports to measure.

Validity looks at whether a test measures what it claims to measure. Only valid tests can be used to be accurately applied or interpreted (Cherry, 2011, Validity). There are three different types of validity: content validity, criterion-related validity, and construct validity. Content validity means that "the items on the test represent the entire range of possible items the test should cover" (Cherry, 2011, Validity). Criterion-related validity means that the test can predict criterion or indicators of a construct. Concurrent validity means that the "test scores accurately estimate an individual's current state with regards to the criterion" (Cherry, 2011, Validity).

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Predictive validity means that a test is helpful in determining how a person is likely to respond (Cherry, 2011, Validity). Construct validity means that a test "demonstrates an association between the test scores and the prediction of a theoretical trait" (Cherry, 2011, Validity).

It is important for tests to be reliable and valid. However, in a practical setting, it is completely unimportant if a test is reliable if the test does not measure what it purports to measure. Tests are used to help determine attributes, aptitudes, and potential problems. A test that cannot do this is useless to someone working in a diagnostic setting. Moreover, the fact is that some tests are going to necessarily lack at least some types of reliability, because human beings are not static, but flexible. Therefore, while reliability is important, it is not as important as.....

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