International audienceIn this paper, we propose a method for structuring a competency repository based on 5 principles. Two of them consist in using a composition relation to define competencies at several levels of abstraction and a prerequisite relation to establish prerequisites between competencies. To illustrate the contributions of these principles, an application in the domain of information systems design and implementation is fully developed. This application is based on the discussions that were carried out within the "Competency Working Group" of the French network of MIAGE (Méthodes Informatiques Appliquées à la Gestion des Entreprises) Masters and within the framework of the IDEFI-N OPENMIAGE project funded by the French ANR (A...