The process of establishing the reliability and validity of any instrument can take years of intensive work. And what can make matters even worse is when the naive or unsuspecting individual wants to create a new instrument to test a new hypothesis. That means that on top of everything else that comes with testing a new hypothesis, there is also the work of making sure the instrument works as it should. If you are doing original research of your own, such as for your thesis or dissertation requirement, be sure to find a measure that has already had reliability and validity evidence well
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