A build using a large group of people working in parallel. People work in parallel on different modules, then assemble them rapidly into a finished product. Together with Digital Fabrication and Language Agnostic Instructionals - this allows for industrial productivity on a small scale. Such productivity is the basis of OSE's Extreme Manufacturing and Distributive Enterprise model.
Swarm builds use Extensive Scalability rather than Intensive Scalability as a means to build things faster with a large group of people. Intesively scaled builds do not allow as large a team to participate, while Extensively scaled builds allow for much better division of labor.
For example, the Seed Eco-Home was built using Extensive Scalability: a large number of small, panelized modules were built by about 12 teams in parallel. This allowed for the complete erection of the 1400 sf house in 5 days.
As another example, the CNC Torch Table v19.10 uses 5'x5' modules, designed such that additional modules can be added to the original to handle larger workpieces. As such, a 5'x10' table is possible (by adding a support under the Y axis for eliminating shaft bending), and so is a 5'x20' (by adding a stronger support to eliminate shaft bending, and so is a 10'x10' by adding support under the X and Y.