Revue française de pédagogie - Année 2002 - Volume 138 - Numéro 1 - Pages 9-17Professional didactics aim at analysing work duties in order to gain competences. This approach's origins lay in the gathering of two trends : work psychology (Faverge, Leplat) underlined the cognitive side that exists in every work. Developmental psychology (Piaget, Vygotski, Vergnaud) insists upon the conceptualisation's role in action. This article offers a few examples of work analysis on professional didactics, highlighting two aspects. The aim is to reveal pragmatic concepts which are real action organisers, in the way that they enable actors to diagnose the situation in which they find themselves. In fact this analysis can only be done by studying further than the work that was given (the task) : it is only by analysing the actors' activity that we can spot the situation's conceptual structure, or more precisely the representation that they make of it. 9 pages Source : Persée ; Ministère de la jeunesse, de l’éducation nationale et de la recherche, Direction de l’enseignement supérieur, Sous-direction des bibliothèques et de la documentation.