What does a collective process in architecture entail and how does it influence the planning of our built environment? Although the hierarchically organised office with its claim to individual authorship is still the dominant form of architecture firm, more and more horizontally organised collectives with alternative approaches to architectural planning are emerging. In this insightful survey of renowned European collectives, Natalie Donat-Cattin offers an overview of their working methods, organisational forms, goals, and projects.