Science use measurement understanding, evaluating and differentiating. Measurement is the display of a feature belonging to an object, fact or attitude with countable symbols. Scientific measurements is intended to create value in relation to a particular phenomenon or the comparision predetermined value. In case there is no predetermined norm value which displays the generalisation of the measurement, problems of reliability and validity arise. In this study, reliability and validity concepts in measurements made without a predetermined value were analyzed.
Key words: Measurement, Reliability, Validity Article Language: Turkish English
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