In a previous study of aerodynamic and acoustic measurements of voice production for groups of female and male speakers to establish normative data, interspeaker variation was often found to be highly correlated with SPL [Holmberg et al., J. Acoust. Soc. Am. 84, 511–529 (1988)]. In this study intraspeaker variation across three recordings is examined for each of three female and three male speakers. Measurements were made from the inverse filtered air-flow waveform, of estimated average transglottal air pressure and glottal air flow, and the amplitude difference between the two first harmonics of the acoustic spectrum for productions of syllable sequences in soft, normal, and loud voice. Although the results show different patterns across both speakers and intensity conditions, preliminary observations reveal that a small amount of SPL variation could be accompanied by large variation in other parameters. For some parameters, the variation was strongly related to SPL, for others not. Statistical analyses will be performed to compare the intraspeaker variation across recordings with interspeaker variation from normal group data, in order to help quantify normal variation. [Work supported by NIH.]