The monitoring and visualization of enterprise-wide and cross-organizational business processes is an important, but also very complex task. The information needed for visualizing processes may be scattered over heterogeneous, distributed information systems. These systems may only support fragments of the process and may use different process meta models. Besides an integrated view on these process data, any process visualization must be flexibly and dynamically adaptable to the needs of different applications and user groups. This paper discusses requirements of a flexible process visualization in distributed environments. This includes process data integration issues as well as issues related to adaptable process visualization.