In 1995-1996, at the request of the Association paritaire du secteur affaires municipales, the IRSST's Work Organization Research Program analyzed all the accidents suffered by firefighters in Quebec's two largest municipalities in 1992. The study describes the accidents that occurred while carrying out five types of work tasks, whether or not they resulted in loss of work time. Accident scenarios linking injuries and task characteristics were developed. These detailed profiles shed light on the interaction between several potential causal factors and suggest preventive action by identifying the situations and risk factors most frequently associated with the most serious accidents.