Similarly, the less-than-perfect aspects of the instruments that are used for achieving a good approximation to reality reduces their internal and external validity, thus generating serious problems as to the reliability and credibility of the measurements.
De igual forma, lo imperfecto de los instrumentos para lograr un buen acercamiento a la realidad disminuye la validez interna y externa, generando con ello serios problemas de confiabilidad y credibilidad de las mediciones.