A production system for individually distinguishable documents of the same kind, wherein the documents are security documents, comprising a device for automatically classifying documents, characterised in that the classification is a quality classification, wherein the production system has the device for quality classification at different points of the manufacturing process and, in the event of a quality classification that indicates a rejection of a specific document, is configured to re-start the manufacturing process for the specific document, wherein the quality classification is determined by a device and the process parameters, such as manufacturing rate or the number of measurements on each product, are adapted over a specific, preferably directly preceding time period depending on the determined quality classification; characterised in that the device of the production system comprises the following: - an input stage , which is configured to receive, in parallel, a plurality of input signals representing measurement values of quality-relevant properties of a document, wherein the quality-relevant properties comprise the dimensions of a product, the uniformity or completeness of a colour application or a sealing, a colour range, the uniformity of the surface and of the edges, the roughness or reflection properties of a surface, the position, identifiability, legibility and/or the quality of the print image of text, lettering and/or security features, - an analysis stage with one analysis unit or a plurality of analysis units associated with different error classes, wherein each analysis unit outputs its own result signal , - an output stage , which is configured to convert result signals of the analysis stage into an at least two-stage quality classification and to output same at an output , and - a plurality of perceptrons arranged in parallel between the input stage and the analysis stage , wherein each perceptron comprises one or more logic circuits or functions, which represent one or a sequence of polynomial functions and/or non-linear functions , transformations and/or activation functions , which are configurable adapted to the property represented by the respective input signal and which are subjected to an input signal fed to the perceptron from the input stage , and wherein an output signal of each perceptron is fed to an analysis unit of the analysis stage . - an input stage , which is configured to receive, in parallel, a plurality of input signals representing measurement values of quality-relevant properties of a document, wherein the quality-relevant properties comprise the dimensions of a product, the uniformity or completeness of a colour application or a sealing, a colour range, the uniformity of the surface and of the edges, the roughness or reflection properties of a surface, the position, identifiability, legibility and/or the quality of the print image of text, lettering and/or security features, - an analysis stage with one analysis unit or a plurality of analysis units associated with different error classes, wherein each analysis unit outputs its own result signal , - an output stage , which is configured to convert result signals of the analysis stage into an at least two-stage quality classification and to output same at an output , and - a plurality of perceptrons arranged in parallel between the input stage and the analysis stage , wherein each perceptron comprises one or more logic circuits or functions, which represent one or a sequence of polynomial functions and/or non-linear functions , transformations and/or activation functions , which are configurable adapted to the property represented by the respective input signal and which are subjected to an input signal fed to the perceptron from the input stage , and wherein an output signal of each perceptron is fed to an analysis unit of the analysis stage . <EOS>