The effectiveness of sport accidents prevention is often considered in terms of communication strategies, in relation with the good enunciation, the correct reception, and ideally, the appropriation of prevention messages and safe methods by participants. The accuracy of these strategies depends on thorough knowledge of accident frequencies, of typical circumstances and risk factors, and of the origins of accident sequences (Bahr & Krosshaug, 2005; Rasmussen & Svedung, 2000). Unfortunately, according to recent studies on mountain leisure and recreation (Soulé et al., 2014), the knowledge of accident facts, causes, and consequences in mountain sports seems perfectible. More than the quantity of information produced, sometimes important, the fragmentation of sources, the heterogeneous methodologies used to collect information, and the data availability, are problematic for a meaningful use of accident data. Corporative, institutional, methodological or judicial stakes are pregnant when it comes to accidents and can partly explain this fragmented picture of accidentology (Soulé et al., 2015).