“…These changes may account for the fact that the fields of occupational health and ergonomics have seen a growing interest for this concept of know-how, especially for the "preventive skills 1[ " that allow workers to protect themselves. This interest is reflected in several studies that aim, on the one hand, to describe the know-how that allows workers to deal with the constraints that are encountered and protect their health (Denis et al, 2007;Chassaing, 2006;Ouellet et al, 2003;Chatigny, 2001a;Lachance, 2000;Authier, 1996;Gaudart; and, on the other, to show the usefulness of acquiring the developed know-how in order to create training content that favours the development of know-how in trainees or apprentices (Vézina et al, 1999). However, studying know-how presents a considerable challenge for researchers because it is very difficult to describe, in particular because of the difficulty workers have formalizing their work methods (Teiger, 1996(Teiger, , 1993Garrigou, 1995, Reber, 1989).…”