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As it becomes increasingly common for organizations to work in a process-oriented manner, single organizations may be dealing with collections of hundreds or thousands business process models. Examples of such collections, which are often mentioned in the literature, include: the BIT Process Library (735 process models)[1], the SAP Reference Model (604 process models)[2], a reference model for Dutch municipalities (around 600 process models)[3], IBM’s Insurance Application Architecture (around 250 process models)[4] and Suncorp’s process model repository for insurance (6000+ process models)[5]. As organizations develop such large collections of business process models, new challenges and opportunities arise. Consequently, it is not surprising to see that also more and more research is done on the topic of process model collections. This is demonstrated by Fig. 1, which shows the number of …