ABSTRACT
The Lowry model has rightly achieved iconic status because it represented the main ideas that would underpin any comprehensive urban model in the simplest possible way. The system of land constraints differs from that used by Lowry. If this causes the land constraints in a zone to be exceeded, then the total amount of basic industry is constrained in that zone and the 'surplus' growth is redistributed. The model moves through updating basic industry, updating unregulated services and then updating the residential location and housing model. The residential location sub-model is the most complex of the sub-models. A useful starting point for the retail subsystem was the previous best-fit parameters found for South Yorkshire in previous work. In order to analyse subsystems, and particularly the residential one, it appropriate to develop a zone graph similar to the one developed for the retail model. The unregulated retail and consumer driven services are represented using the standard BLV retail model framework.
