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Objective: to present and discuss conceptual bases and methods for evaluating the content, construct and criterion validity of self-reported measuring instruments.  Method: theoretical study based on the concepts of the Consensus-based Standards for the Selection of Health Measurement Instruments and those evaluated in the Evaluating the Measurement of Patient-Reported Outcomes, which includes concepts of instrument assessment to assess patient-reported outcomes.  Results: validity is significant for the methodological quality of an instrument; however, it is a relative criterion, since it depends on the adequacy of the instrument to be measured. There are three different validity measurement properties described in the literature: content, construct and criterion validity.  Conclusions: as validity is an important property, it is recommended that it be verified in studies that aimed to develop new scales and in those that adapted and validated for another culture or population.

PSYCHOMETRIC PROPERTIES OF MEASUREMENT INSTRUMENTS: CONCEPTUAL BASIS AND EVALUATION METHODS - PART II