“…A previous study (2) on the correlation between the VAS and the NS in the perceptual-auditory evaluation of the G also suggested such a proposal to allow a better definition of normal variability of the voices and a separation of the slight deviations, as well as a more precise category of intense deviations (2,15) . In the present research, the sustained vowel /a/ task produced on a regular basis was chosen, once that, according to the literature, the results found in the perceptual-auditory evaluation may differentiate according to the stimulus presented, also influencing the inter-evaluator concordance (11,13,19) . The sustained vowel is easier to be obtained and standardized, once it is not affected by the articulation of sound of speech and it is characterized by a relatively static configuration of the laryngeal and supralaryngeal muscles with a minimum variation while producing it (20) .…”