Abstract: In a system for optimizing production installations and/or processes of a metallurgical installation each production installation and/or process comprises a separate data management device. Entities of the metallurgical installation that are relevant for the respective part of the production installation and/or process are identifiable by local identifiers and the local identifiers can be used to retrieve data of separate data management devices. Within a central data management device each entity of the metallurgical installation has an associated global identifier. The applicable local identifiers of the separate data management devices are associated with the same entities of the metallurgical installation by the respective global identifier in the central data management device. Optimization involves at least some of the data from the separate data management devices being aggregated and evaluated by means of the global identifiers.