For a number of years it has been recognized that the social dynamics of group interaction is an import factor in the origin of accidents and in the way how accidents or accident-prone situations are handled in aviation (cf. Helmreich l997a, l997b). Factors related to interpersonal communication have been implicated in up to 80% of all aviation accidents over the past 20 years. As a reaction to this, Crew Resource Management (CRM) has been developed with the goal of rating and improving crew performance in aviation and in other fields in which professional groups interact in situations of high taskload and potential risk (cf. Helmreich ea. l999). As far as this can be estimated at all, installing CRM techniques in the major American and European airlines has resulted in a definite improvement in the safety of commercial aviation. In spite of this success of CRM, practitioners in the field feel that, beyond the general social dynamics of group interaction, there might be potential problems relating to language and communication in such settings.