Published: Feb 1997
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Validity is a Holy Grail, a supreme and basic virtue in the realm of data relationships, research, and measurement in general. It is sometimes equated with truth, thus becoming the ultimate good, which is probably overstated. But researchers should have the concept of validity ever present, at least operationally, even though the specific term is not always used. Being virtuous, we know what we should do and our behavior generally conforms. So let's try to muster the facts and suppositions.