Information system's ontology is not frozen: it must evolve in the course of its life cycle to keep its consistency and its coherence in dynamic and multi-disciplinary domains. However, any change to be taken care at the level of Information System (IS) design ontology is a wonderful source of new structural and semantic disconnectedness, which must be perfected to keep the ontology operational and consistent.

In this paper, we define an approach for the recognition of the IS design ontology evolution. Change operators are defined for this goal. Besides, strategies of evolution are defined to manage the consequences of these changes.