The physical changes to Perth which have occurred during the last 45 yearshave been strongly linked with a transformation in the sub-regional econo-my and have also reflected significant cultural changes in the sub-region.The paper defines these changes and theories as to causes and effects.Perth, one of Scotland's mediaeval capitals, lay at the cultural interface ofPicts, Celts and Britons. It occupies a key bridging position on the Tay,Scotland's longest river. It was also a major focus in the development of therailway networks across Scotland from mid-19th century until the 1950s.Since then, the decline in railways, in textile manufacturing and in dyeinghas led to significant redundancies of land and buldings In the city. Initially,however, most of these sites were retained by their owners; so that devel-opers looked farther afield for sites to accommodate new developmentsIn the 30 years from 1945 to 1975, the urbanised area of Perth expandedsubstantially whereas the population grew by only one thousand approxi-mately. Thus the physical character of this historically compact and conser-vative burgh was much diluted.In the last 15 years, growth has continued on the outskirts of the city buteven more so in the surrounding villages and small towns. Also in thes last15 years or so, the central area has changed dramatically through redevel-opment, though with some restoration. The years 1975 and 1979 can beidentified as turning points in local government administration and centralgovermnment policy respectively. Perth's position as an administrativecentre vis-a-vis Dundee was re-assessed widely; and the change to Conser-vative government at Westminster brought about some political favours for the town. More generally, increases in standard-of-living and in mobility, and external influences bringing about changes in patterns of social activity, have altered the sub-regional culture almost totally. The surrounding service catchment has altered greatly in extent and in its relationship to the city.The ethnic composition of the population has changed considerably throughmigration and the increased opportunities for meeting people who reside inpalaces remote from Perth. This has accelerated the process of change.