Architecture is always the product of collaboration. To realize a vision for a particular building, an architect brings together a great number of people – not only the client, who provides the economic support, but also the engineering and structural design experts and the construction company in charge of the building site and the crafts(people) – steering all thise involved toward a single destination.
The architect assumes a role more akin to that of a director or conductor, in the sense that he or she leads many people without being directly involved in creating the final product.
Part of the solution might come from the architecture world as well -- here are some other Patterns by Christopher Alexander:
Pattern #31 - Promenade: Each subculture needs a center for its public life: a place where you can go to see people, and to be seen.
Pattern #61 - Small Public Squares: A town needs public squares; they are the largest, most public rooms, that a town has. but when they are too large, they look and feel deserted.
Pattern #69 - Public Outdoor Room: There are very few spots along the streets of modern towns and neighborhoods where people can hang out, comfortably, for hours at a time.
Pattern #42 - Sequence of Sitting Spaces: Every corner of a building is a potential sitting space. But each sitting space has different needs for comfort and enclosure according to its position in the intimacy gradient.
Pattern #147 - Communal Eating: Without communal eating, no human group can hold together.
[...] groupthink is avoided by a social network structure that allows a dynamic and diverse periphery to provide new ideas, but the core of the network needs to be tightly bound to be able to take action. That's the main point of Building Sustainable Communities through Network Building by Valdis Krebs and June Holley. When studying a community over time, they suggest a vibrant community is made up of four stages: Scattered Clusters Single Hub-and-Spoke Multi-Hub Small-World Network Core/Periphery The ideal core/periphery structure affords a densely linked core and a dynamic periphery. One pattern for social software that supports this is an intimacy gradient (privacy/openness), to allow the core some privacy for backchannelling. But this requires ridiculously easy group forming, as the more hardened the space the more hard-nosed its occupants become.