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Business Process Management (BPM) has gained remarkable importance in research and practice in the last years. Innovative information and communication technology (ICT) is a driver for the effectiveness and efficiency of enterprise collaboration and the management of inter-organizational business processes. In this context, cooperating enterprises need a shared understanding of their own processes, those of their partners as well as of emerging inter-organizational process structures. In order to create such a shared understanding, the concept of collaborative modeling can serve as a useful approach. This article introduces a concept for collaborative business process modeling and its implementation in the CoMoMod tool. The tool supports several aspects of collaborative process modeling, such as simultaneous work of spatially distributed modelers on one process model diagram. Furthermore the tool permits synchronously creating a collaborative model with different modeling languages by automatically mapping and converting the different model representations. The proof of concept utilizes Event-driven Process Chains (EPC) and Petri Nets. The usage of an integrated chat messaging service supports communication during the process of collaboratively modeling business process.