This paper is dealing with the possibilities for an hierarchical structured presentation of the actual process information of power plants by means of computer aided monitoring.For this purpose at first the applied technics of visual information coding such as colours, symbol sizes and types for active and passive elements have been investigated. Using these results a 4 step display hierarchy with both direct and indirect selection methods, different display formats - like safety lockings, alarm signallings, system overviews, detail display formats have been constructed with graduate information layers. For receiving an integrated, homogenous solution the whole information management and organisation is treated by a process computer.The so developed process video system has been implemented at the BWR-Simulator of VGB-Kraftwerksschule (west german training center for power plant operators) During the one-year test period proposals for improvements and extensions - being made by operating and training staff - has been built in whenever possible.Furtheron there will be given an outlook about the algorithmical and logical computations of the process information flows by coupling known state space observer technics with a corresponding predicate logical description. As an example an on-line rule based operator manual will be described which is driven by operator requests to the process video system and is working on an updated process state base.