Business integration requires that each partner can guarantee not only the quality of its products, but also the qualification and competence of its workforce. Usual models, like those included in the Human Resource Management modules of Enterprise Resource Planning (ERP) systems, are not sufficient in highly constrained domains like aeronautics. We show in this chapter how a generic competence management model has had to be modified and enlarged to satisfy such constraints. On the base of this model, software has been developed that is currently being implemented in three sites belonging to two companies. We shall show how such software may allow, on one hand, to guarantee that only competent people have been involved in the various steps of the manufacturing process, but also to improve the way operational competences are managed in the company.