The Research Group investigates processes of spatial development and planning history from a contemporary historical perspective. A particular focus is laid on the analysis of the history of society and planning in both German states in their European contexts. The research group analyses the socio-spatial dynamics and development paths of cities and neighbourhoods with a focus on planning interventions and practices of appropriation by social groups and political initiatives. The research group works interdisciplinarily at the interface of urban, planning and architectural history. Special attention is paid to the biographies and patterns of action of architects, planners and civil society actors, as well as to the practices of circulation of planning models and their implementation across borders and political levels. The legacy of historical processes for actual socio-spatial conflicts and the concepts of digital history in research and archiving strategies form important points of reference for the investigations.