The most authoritative source regarding the development and evaluation of educational and psychological tests is published by name of the Standards for Educational and Psychological Testing and briefly referred to as the Standards. Thus, such statements as ‘the test is valid’, ‘the validity of scale’ or ‘the scores are valid’ should not be used. In short, validity is not a property of a test or measurement instrument itself, but it is a property of the proposed interpretations and uses of the scores. Validity is the degree to which evidence and theory support the adequacy and appropriateness of the proposed interpretations and uses of the scores obtained from the test or measurement instrument applied to a particular population or sample. Validity has changed in the last 100 years, in other words, evolved. That is to say, validity is a crucial concept in psychometrics, but it is still misunderstood and misused. Validity is the most fundamental cerebration in educational and psychological testing.
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