Résumé : This paper aims at understanding how interactions are connected with instrumental and social satisfaction, and perceived task and relationship conflict. Participants were 264 students divided into 41 teams and involved in a design and building group experiment which was videotaped and integrally coded with the IT3D coding system. We highlight the significant positive relationship between socialization interactions and satisfaction. We notice that when interactions carrying task conflict (content) are increasing, instrumental and social satisfactions are lower. In contrast, process conflict and relationship conflict show no relationship with team member satisfaction. We also investigate the relationship between observed conflictual interactions in groups and the perception of conflict by their members. Only the perception of task conflict is related to the proportion of observed interactions opposing ideas in the group, whereas interactions showing signs of weak relationship conflict are not globally perceived as such. Finally, the study of team member satisfaction and perception of conflict confirms that perceived task conflict is harmful to instrumental and social satisfaction, whereas perceived relationship conflict also impacts negatively social satisfaction.