Computer-assisted simulation allows us to explore and better understand phenomena which may at first appear counterintuitive. It also, however, entails certain risks which the modelization/simulation specialist must compose with. The object of this paper is to show that when it comes to simulation, dangers and virtues cannot be dissociated. Thus the use of a formalized model is as likely to empoverish as it is to enrich our understanding of social phenomena; the formalized model therefore plays a very important heuristic role in extracting complexity (enriching our vision) from simplicity (poorness of the model). The flexibility of the model as well as that of its use allowing to repeat the experience whilst varying the angles of approach and adding or modifying certain parameters of the experience, the researcher is given great opportunity to master the complexity which she/he may then instill in her/his investigation.