Taming 'wild' Vienna? The handling of informal settlements by the planning authorities – perspectives, discourse, (counter)actions in the interwar and post-war periods.

This paper presents a periodized overview of informal urbanization in Vienna in the twentieth century. It offers a new perspective on the evolution of planning discourse and the phenomenon's handling by planning authorities. The variegated manifestations of 'Informal Vienna' triggered an ongoing dispute on how orderly city development could be re-established after 1945. Our approach combines quantitative and qualitative aspects and illuminates not only the shifting significance of informal urbanization over several decades – especially in their lengthy formalization process – but also highlights the co-evolution of formal planning and the Viennese informal 'grand project'. In a comparative historical analysis based on the evaluation of the balances of formal and informal production of space, previous narratives of Red Vienna's dominant role in answering the 'housing question' in the interwar period (and beyond) are challenged. The frictions it created with the instruments and categories of formal planning, we argue, are crucial to understanding the consequences of informal development in Vienna. Furthermore, we present a typological approach on the grades of informality which allows for a reconstruction of the formalization processes in time. This 'graduation of informality' contributes to the ongoing attempts to classify various manifestations of informal urban development in the global South and North. [ABSTRACT FROM AUTHOR]