Abstract: The invention relates to a diagnosis method which permits continuous monitoring of the available resources in a production process, into which a number of supply links are incorporated in the form of a network and supply a system provider or other supply links with raw materials, semifinished products, components and services. Each supply link has an input buffer, an output buffer and a process stage, on the basis of the design of which the supply link determines an identification number which characterizes the operating state of this supply link. The predicted demands of the system provider and the current reserves in the buffers of each supply link are used as a basis to calculate—using the identification numbers of the supply links—for each supply link whether its reserves satisfy the predicted demands of the system provider, i.e. whether it is capable of supplying.