What is test reliability and test validity? Which is more important to have in a good employment test?
Reliability refers to the repeatability or consistency of obtaining similar scores when using the same test or assessment procedure with the same person. Reliability is a necessary component for establishing validity, but is not sufficient by itself. Validity refers to the accuracy of how well a test predicts what it is supposed to test. So, for an assessment procedure to work, it must be both reliable and valid. Statistically speaking, reliability sets an upper limit to the validity of a test, so without acceptable reliability you cannot have a valid test.
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