This work is guest-edited by Neil Leach. What is the impact of digital technologies on the design and analysis of cities? For the last 15 years, the profound impact of computer-aided techniques on architecture has been well charted. From the use of standard drafting packages to the more experimental use of generative design tools and parametric modelling, digital technologies have come to play a major role in architectural production. But how are they helping architects and designers to operate at the urban scale? And how might they be changing the way in which we perceive and understand our cities? This work features some of the world’s leading experimental practices, such as Zaha Hadid Architects, R&Sie(n), Biothing and Xefirotarch. It takes in exciting emerging practices, such as moh architects, kokkugia and THEVERYMANY, and work by students at some of the most progressive schools, such as the AA, Dessau Institute of Architecture and RMIT. Contributors include: Michael Batty, Benjamin Bratton, Alain Chiaradia, Manuel DeLanda, Vicente Guallart and Peter Trummer.