Résumé
In information systems, model integration consists in grouping into a single model all the business entities of several thematically connected models. In this paper, five operations are proposed to assist this integration: an alignment model which highlights the correspondences between the models; two union models and two intersection models built up with the common elements. The union and intersection models are calculated according to either a mechanism based on the semantics of business entities or a mechanism based on the binary description of these entities. Whatever the mechanism used, the union models are the smallest of the model unions and the intersection models, kernel of all models, are the greatest intersections of the models. These five operations are achieved with the help of Formal Concept Analysis (FCA).