People differ in the way they notice environmental changes and become aware of-environmental problems,(1) The perception and evaluation of environmental settings involves role-specific values. These vary with the influence which someone may believe to have - or actually has - to realise environmental changes. It follows that both the processes and products of environmental decision making look different to agents for change, compared to the views of other, ordinary environmental users.(2) Evidence from psychological research shows that environmental specialists do not, view city patterns like other people.(3) Residents and other regular users of an urban area might value it'f or theopportunities it provides for making social contacts. They might tolerate certain-phys-ical disadvantages in favour of the social qualities of their area.(4) Architects,Andtown planners might view the same area for its rehabilitation potential- by taking note- predominantly of its unsatisfaâtory physical characteristics which they would wish to improve.(5) Differences in the evaluation of environmental settings such as the ones outlined above exemplify the notion that actions and perceptions are inseparably related.(6) They imply a need to distinguish more clearly between different behavioural action spaces (7); i.e. the rolespecific-action spaces of agents for environmental change, those of public administrators in charge of environmental control, and those of other ordinary users of the environment.(8)