Validity will tell you how useful a test is for a particular situation; reliability will tell you how reliable a score on that test will be. You cannot draw valid findings from a test score unless you are sure that the test is dedicated. Even when a test is reliable, it may not be valid.
Reliability and validity are concepts used to evaluate the quality of research. They demonstrate how well a method, technique or test measures something. Trustworthiness is about the consistency of a standard, and validity is about the accuracy of a measure.
Reliability (or consistency) refers to the strength of a measurement scale, i.e. how far it will give the same effects on separate events, and it can be assessed in different ways; strength, internal consistency and equiva- lence. Validity is the extent to which a scale measures what it is intended to estimate
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