Based on the experience of managing >20 such events during the last decade, the authors' understanding of a mass-casualty incident is that it is an event in which there may be many victims, but only a few that actually suffer from life-threatening injuries. To make an impact on survival, one must identify those who are severely wounded as quickly as possible and offer those patients opti-mal care. Experienced trauma physicians are the most important resource available to achieve this objective, and they should be allocated to the treat-ment of seriously injured victims instead of more traditional management roles such as triage and incident manager.