This manuscript investigates the role of argumentative competence in interpersonal dyadic exchanges. Specifically, this study examined the two sub-dimensions of competence, argumentative effectiveness and appropriateness, and their connections with argumentative traits, situational features, and argument satisfaction. In addition, self-perceived versus observed argumentative competence were compared. Participants in the study completed measures before and after a face-to-face argumentative discussion with another person about one of two possible topics. Results revealed that argumentation traits had little effect on argumentative competence, but competence was (...) predicted by one’s knowledge about the topic. Argument satisfaction depended only on arguers’ own competence, not their partners’. Finally, a perceptual bias existed regarding argument effectiveness in that participants rated themselves higher than did observers. (shrink)