A method for simulating fictitious system states of a central computer-controlled system, in particular a vehicle system or a weapon system. The system has a central computer (1), operating devices (3), sensors (4) and displays (5) and actuators (6). A simulation computer (2) can be connected to the system, and the system has a normal mode and a simulation mode. The central computer (1) receives on the input side of the operator panels (3) or sensors (4) real data. This real data is used by means of system-specific logic software for the calculation of new system states, and the new system states are fed to the output side of the displays (5) or actuators (6). In simulation mode, the central computer (1) from the simulation computer (2) receives predetermined simulation data with which the real data of the operating devices (3) or sensors (4) are at least partially overwritten before calculating the new system states and which together with the not Overwritten real data using the system-specific logic software to calculate the new system states are used.
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