-The article presents ontologically systematized means of creating an intellectual environment for engineering interaction in the context of production system. It is noted that the use of modular ontologies to ensure data stability is a key factor in the "cross-linking" of local subject areas in integrated systems for planning production resources. The composition of ontological modules, which should be presented in an intelligent engineering interaction environment, is considered in the form of targeted knowledge about tasks and methods for their solution within the framework of the modeled domain. A method of decision support for the management of production systems is proposed, implemented using modular and ontological technology in Petri nets and rules.Keywords-ontology, management, intellectual environment of engineering interaction; technology of the ontological system, Petri nets, production systems