Integrated process support is highly desirable in environments where data related to a particular business process are scattered over distributed, heterogeneous information systems. A business process monitoring component is a much-needed module in order to provide an integrated view on all these process data. Regarding process visualization and process data integration, access control (AC) issues are very important but also quite complex to be addressed. A major problem arises from the fact that the involved information systems are usually based on heterogeneous AC components. For several reasons, the only feasible way to tackle the problem of AC at the process monitoring level is to define access rights for the process monitoring component, hence getting rid of the burden to map access rights from the information system level. This paper presents the Proviado process visualization framework and discusses requirements for AC in process monitoring, which we derived from our case studi...