Method for controlling a technical system having multiple functionally linked system components (T1, T2, R), wherein a)multiple independently operable functional modules (IO, SIM, OUT) access a common data model, wherein - the functional modules (IO, SIM, OUT) comprise the following functional modules: an interface module having an interface to the technical system, a simulation module and an output module, and - the data model comprises data components (DT1, DT2, DR) associated with the system components and accordingly linked and simulation model data for a simulation model of the technical system, b) the functional modules (IO, SIM, OUT) are actuated by a flow controller and the flow controller and a respective functional module (IO, SIM, OUT) have selection data (S1,...,S4) associated with the functional module (IO, SIM, OUT) transmitted between them that the respective functional module (IO, SIM, OUT) takes as a basis for selecting model data of the data model and for accessing the selected model data, wherein input data of the respective functional module (IO, SIM, OUT) are read from the common data model as selected model data and output data from the respective functional module (IO, SIM, OUT) are stored in the common data model as selected model data, c)the interface module continuously captures operating data of the technical system and stores them in the data model by means of selection-data-specific access, d)the simulation module reads the operating data and simulation model data from the data model by means of selection-data-specific access, takes the read operating data and the simulation model data as a basis for ascertaining a dynamic response of the technical system and stores simulation data about the ascertained dynamic response in the data model by means of selection-data-specific access, and e) the output module reads the simulation data from the data model by means of selection-data-specific access and outputs them to control the technical system. a)multiple independently operable functional modules (IO, SIM, OUT) access a common data model, wherein - the functional modules (IO, SIM, OUT) comprise the following functional modules: an interface module having an interface to the technical system, a simulation module and an output module, and - the data model comprises data components (DT1, DT2, DR) associated with the system components and accordingly linked and simulation model data for a simulation model of the technical system, - the functional modules (IO, SIM, OUT) comprise the following functional modules: an interface module having an interface to the technical system, a simulation module and an output module, and - the data model comprises data components (DT1, DT2, DR) associated with the system components and accordingly linked and simulation model data for a simulation model of the technical system, b) the functional modules (IO, SIM, OUT) are actuated by a flow controller and the flow controller and a respective functional module (IO, SIM, OUT) have selection data (S1,...,S4) associated with the functional module (IO, SIM, OUT) transmitted between them that the respective functional module (IO, SIM, OUT) takes as a basis for selecting model data of the data model and for accessing the selected model data, wherein input data of the respective functional module (IO, SIM, OUT) are read from the common data model as selected model data and output data from the respective functional module (IO, SIM, OUT) are stored in the common data model as selected model data, c)the interface module continuously captures operating data of the technical system and stores them in the data model by means of selection-data-specific access, d)the simulation module reads the operating data and simulation model data from the data model by means of selection-data-specific access, takes the read operating data and the simulation model data as a basis for ascertaining a dynamic response of the technical system and stores simulation data about the ascertained dynamic response in the data model by means of selection-data-specific access, and e) the output module reads the simulation data from the data model by means of selection-data-specific access and outputs them to control the technical system.