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Cyber-physical systems (CPS) require event-based control paradigms such as complex event processing (CEP) to have adaptive analytical control mechanisms. CPS are becoming a high-profile research topic as they are key to disruptive digital innovations. We discuss from a requirements engineering perspective how current approaches lack support for the engineering of CPS events and respective CEP solutions. In addition, the paper summarizes results of a comparison of event models and preliminary work on a logistics case study.