ABSTRACT
Spatial interaction concepts lie at the heart of much urban and regional modelling. Indeed, a system of models can be developed to cover most of the major subsystems, with each transport or location component constructed on the basis of the appropriate spatial interaction element and linked with other relevant factors. Such a model system was described, for example, in Wilson (1974). The purpose of this chapter is to report the state-of-the-art which has been reached nearly ten years since that book was written, to present current research problems and to examine the way in which currently available models can be used in planning. Comparisons with other approaches to urban modelling are made briefly.
