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Order elements are often not punctually or synchronically provided in supply chain processes involving the convergence of different material flows (e.g., assemblies). The starting point for this paper is the growing significance of coordinating supply chains. In particular, increasing complexity makes it more difficult to synchronize material flow at convergence points and thus in turn to attain logistic cost and performance targets. Currently, a model suitable for planning and controlling the logistic quality of converging processes as well as for describing existing interactions is only available conditionally. With the allocation diagram, a new model was developed. This model allows the description of the interactions between the supply processes and the provisioning situation at the converging points in the material flow. The validation of the developed model correlations included a simulation based verification of the results. Moreover, applying it in various enterprises confirmed that there was a sufficient level of precision and that the approximation equations could be implemented in the practice. The correlations of the developed model can be used to identify weak points in the supply chain and to derive measures for improving it. The initial situation as well as a target situation for the individual supply processes can each be depicted with the allocation diagram. With the aid of the approximation equations the impact of the changes on the provisioning situation can be determined and visualized.