The primary aim of this paper is to argue that the concepts of visual access and occupant response represent an important link between environment and behaviour. Visual Access (VA) is a design criterion not only in terms of visual aesthetics and socio-spatial relations. VA influences the way a building or setting functions for it occupants. The focus of this paper is on behaviour in an emergency such as a fire. In this respect, spatial analyses need to address physical structures, spatial configurations, VA and Visual Access Configurations (VACs). Attention is required to the information inhibited or conveyed by alternative VACs.