This article presents two studies aimed at validating a French version of Snyder' s Self- Monitoring Scale (18 items) (Snyder and Gangestad, 1986), translated into French as « Echelle de monilorage de soi ». The psychometric properties, construct validity, and latent structure of the scale, presented in two formats (binary and Likert), ivere evaluated in the first study. The results revealed the psychometric superiority of the binary version, as initially proposed by Snyder (1974) . In addition to its satisfactory internal consistency and good temporal stability, this version exhibited better predictive validity than the Likert version. Indeed, unlike the Likert version, the binary version was able to detect the expected link between high self- monitoring and psychological androgyny. Concerning the latent structure, confirmatory factor analyses indicated that the three-correlated-factor solution provided the best fit to the data. The second study served as an empirical lest of the predictive value of the proposed scale. Eleven triads of subjects who differed in self-monitoring level were filmed in interaction situations. Independent judges viewed the filmed sequences in order to rate each actor's sense of initiative, ease in interactions, sociability, and timidity. As expected, the subjects with high self-monitoring appeared to the judges as more at ease, more sociable, and less timid than the other subjects.