IBM is one of the biggest IT-companies worldwide. One of their activities is providing hardware solutions and offering service contracts to their customers. The Service Parts Operations department within IBM is responsible for keeping enough spare part inventory, to fulﬁl these contracts for the EMEA-region (Europe, Middle East and Africa). Their goal is to do this at minimal costs and to achieve this, many processes are automated by using the software tool Servigistics. This tool monitors the real-time status of the supply chain and automatically places orders, to keep the inventory level between certain levels, that are calculated based on historical demand. An important function of this tool is to track whether the inventory level will be sufﬁcient for the next two years.