The Algerian enterprises are faced to the international industrial and economic competition which requires a complete reorganization of their structure. The modeling concept can satisfy this need and led to many techniques. However, none of them is complete and allows modeling all the aspects of a system.

From a theoretical study and real cases of Algerian enterprises, we developed a knowledge framework through a list of criteria related to characteristics of enterprise modeling. In this context, this article deals with a knowledge representation by a domain ontology realized with the Protégé tool.