The purpose of this study was to analyze the role of dyadic verbal peer interactions in a team sport such as handball. Participants, 20 boys and 20 girls aged between 11 and 12, were assigned to two learning condition groups. The task was an instructional setting in team handball (2 attackers against 1 defender in each half court). The experimental group with verbal exchanges was expected to obtain higher performances in the post-tests than those who had not interacted verbally between playing sequences. The secondary objective was to investigate whether dyadic gender had an effect on tactical choice and cognitive skills in playing games. The experiment demonstrated the superiority of the dyadic verbal interaction group over the non-interactive group as regards tactical choices and action projects. It also showed gender differences since males performed better females with regard to action efficiency. The results are discussed within the theoretical framework of the social psychology of acquisition and development and within that of teaching for understanding. In conclusion, the socio-constructivist approach would seem to be pertinent in team sport decision-making tasks. (Contains 1 figure and 3 tables.)