Reliability and validity in questionnaire design

Reliability refers to the consistency in reaching the same results when the measurement is made over and over again. Validity refers to the degree to which the question measures what it is supposed to be measuring. While a valid measure is always reliable, a reliable measure is not necessarily a valid one. While pretesting, revision and further testing a questionnaire may increase its reliability, it will not necessarily increase its validity. One way to ensure that an instrument really does measure what it is supposed to measure is to compare the results with a 'yardstick' - an external measurement.

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