Abstract: Monitoring a first system of a technical plant for producing a product is performed by feeding first input data into a first logic unit; evaluating the first input data by the first logic unit; outputting first output data by the first logic unit, the output data characterizing a first status of the first system monitored. To improve known concepts for status monitoring, the first input data includes—first sensor data provided by the first sensors located in the plant, first data calculated by a first process model, the first process model mapping a first process in the plant, or first automation data of a first function of a first automation system in the plant; first design data characterizing physical variables of the first system and/or the plant, first parameterization data variable and predefinable relating to the first system and or the plant, and operating data characterizing production of the product.