Current debates in urban development display a rising awareness that several cities in Europe and the US must deal with challenges of long-term urban shrinkage. However, on an international scale it is still not clear if and how planning paradigms, planning systems, planning strategies and planning cultures are changing when shrinkage and decline are taking place. This paper investigates how planning is transformed in view of shrinking cities. For this purpose, the paper introduces four cities’ storylines framed by shrinkage. Particular focus lies on the question if and how dealing with decline and shrinkage led to changes in urban planning and brought about different planning styles.

Various institutional and cultural settings have shaped spatial planning systems with comparable features; however, such systems have been adapted to specific cultural, normative and spatial conditions. In line with the growing demand for international knowledge exchange in urban and regional planning, planning cultures have recently come into sharper focus. Moreover, it has become widely acknowledged that many cities in Europe and the USA have to deal with challenges posed by long-term demographic and economic changes. This also holds true for Japan. The objective of the research presented here is to comparatively investigate changes in planning cultures in view of shrinking cities in the USA, Germany and Japan. The findings will allow us to detect interdependencies between changes in planning cultures and societal changes in the wake of shrinkage, and finally to derive hypotheses for both the future-oriented development of shrinking cities, and the development of planning cultures based on the comparison of cultural settings. In this respect the paper concludes with the hypothesis that there might be planning cultures that are not framed by geographic entities (nations, regions, cities), but rather by topics along shrinking cities. This could offer insight into a new research sphere of ‘topical planning cultures’. While lasting effects and successes of policies and strategies applied in shrinking cities remain to be seen, their influence on a broader knowledge exchange, contextualisation and innovation in the sphere of planning cultures is evident.

In past decades, many cities and regions have underwent structural transformations—e.g., in old industrialized “rust belts” or in peripheral rural areas. Many of these shrinking cities have to face the challenges of long-term demographic and economic changes. While shrinkage is often related to post-industrial transformations in the USA, in other countries, such as Germany, for example, the causes are related to changing demographics with declining birth rates and the effects of the German reunification. Many cities have tried to combat shrinkage and have thus developed a variety of policies and strategies such as the establishing of substitute industries. To assess the sustainability of this approach, this paper investigates the cities of Cleveland, USA and Bochum, Germany in a comparative analysis following the most similar/most different research design. The paper shows that substitute industries might lead to new development paths for shrinking cities; however, whether these paths stimulate sustainable development is dependent on those who are benefiting from these developments and to what extent.