AbstractIntegrating qualities and aspects particular to their previously independent practices, the work of Ed Keller and Carla Leitao of collaborative design and research practice a|Um Studio spans scales and sites of application. The practice embodies a collective intelligence in a number of ways. At the scale of design practice the collaboration bridges the design cultures of Europe and the US. At the scale of urban practice, its large‐scale planning proposals investigate forms of collective use and activity within the city. In addition, its interactive installations and gaming interfaces explore the potential of film and responsive technology to enable informational exchange and production. Copyright © 2006 Ed Keller & Carla Leitao. Published by John Wiley & Sons, Ltd