We consider the problem of scheduling multiple projects subject to joint resource constraints. Most approaches proposed in the literature are based on the assumption that resources can be transferred from one project to the other without any expense in time or cost. In many real-world settings this assumption is not realistic. For example, cranes have to be transported to another location and reinstalled there. We generalise the multi-project scheduling problem by addition- ally including transfer times and cost. In order to consider this aspect, resource transfers are classified and new resource roles in project scheduling are introduced. We define the modified multi-project scheduling problem with transfer times (RCMPSPTT), formulate a basic and an extended integer linear programme with transfer times. Eventually, it is supplemented by cost considerations and introduced as resource constrained multi-project scheduling problem with transfer times and cost (RCMPSPTTC). A final computational analysis evaluates the presented models.
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