This provocative book argues that it is high time the practice of architecture moved away from the ego-fuelled grand visions of `starchitects' to a networked, collaborative, inclusive model inspired by 21st-century trends such as crowd-sourcing, open access and mass customization. But how can collaborative design avoid becoming design-by-committee? Carlo Ratti and Matthew Claudel deftly navigate this and other vital questions, considering along the way the applications of open-source architecture not only conceptually, but also in practice. Open Source Architecture is a rallying cry to students and open-minded professionals seeking new perspectives on a profession that the authors passionately believe to be moribund.