A system for monitoring a modular process plant complex having a plurality of interconnected process modules each of which includes a plurality of interconnected physical control objects. The physical control objects and their interconnections inside a physical process module are displayed together with associated control parameters as stylized control objects on an operator display screen with four different zooming levels: a first zooming level displaying diagrams of aggregated key performance indicators of the plant complex; a second zooming level displaying diagrams of the key performance indicators; a third zooming level displaying process modules associated with a plant area of the second zooming level; and a fourth zooming level displaying one or more physical control objects included in a process module of the third zooming level together with the associated control parameters and interconnections as stylized control objects on the operator screen display.