Abstract. The running of the bulls, one of the most famous events in the world, takes place every year during the San Fermin festival in Pamplona, Spain. It is extremely dangerous, especially for runners who are not sufficiently familiar with the rules. Through access to the tacit knowledge of an expert bull runner and the creation of a specific knowledge model, we may be able to reduce the risk to those participating in the event. The concept maps used for this purpose have given proof of their effectiveness when it comes to representing the reality of the run in a conceptually transparent manner. The resulting knowledge model includes three concept maps, with numerous links, relating to descriptive features of the run, the real dangers it entails and the characteristics that would be desirable in prospective runners. The model will provide an excellent tool for informing the debate among the various agents concerned, and their conclusions will lead to an improvement in safety conditions during the event.