Instrumentos de medida desempenham um importante papel na pesquisa, na prática clínica e na avaliação de saúde. Key words: Validation Studies Reproducibility of Results Surveys and Questionnaires The assessment of instruments measurement properties is useful to subsidize the selection of valid and reliable tools, in order to ensure the quality of the results of studies. In this article, the main criteria and statistical tests used in the assessment of reliability (stability, internal consistency and equivalence) and validity (content, criterion and construct) of instruments are presented, discussed and exemplified. Validity refers to the property of an instrument to measure exactly what it proposes. Reliability is the ability to reproduce a result consistently in time and space. Reliability and validity are considered the main measurement properties of such instruments. Studies on the quality of these instruments provide evidence of how the measurement properties were assessed, helping the researcher choose the best tool to use. Measurement instruments play an important role in research, clinical practice and health assessment.
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