Abstract: In a network using quality test letters (QTL), transport courses are automatically analyzed and physical characteristics are recorded over time during the transport and subsequently read out and classified. The method identifies each QTL message in a node, and determines spatiotemporal relations with respect to nodes passed through. The logistical process chain passed through by each message is automatically determined with process elements from the spatiotemporal relations. All possible required transport courses of each QTL message sent are automatically generated, starting from a respective point of network entry and point of network exit, with associated times as well as selected transport conditions from defined transport rules between the nodes of the logistics network and from a description of execution sequences in the nodes and the relationships between the nodes.