Simulation, GIS and CAD software, 3D visualizations, 3D printers and drone technology have become part of the digital infrastructure for planners. They use digital tools and software to analyze, understand and shape the future of cities. The dissertation project investigates how digital arrangements coconstruct the design and planning practicse of urban planners. Martin Schinagl does this by applying methods of qualitative social research and ethnographic workplace research in private and public planning offices. By cross-culturally comparing a number of planning offices in different cities of the world (Lagos, New York, Frankfurt), the project aims to find out how communicative actions and spatial imaginations differ and resemble each other in mediatized working environments.