Role-playing games and computerized models are increasingly used to support negotiation processes with training, learning or policy making aims. They both have advantages and inconvenient. The joint use of both tools is supposed to improve the support. But no methodology exists to design and then analyze their combined used whereas they are assumed to influence negotiation processes. The aim of this article is, through the presentation of an experiment, to give some element to go further in the reflection of that issue. (Résumé d'auteur