Machines can work cooperatively to manipulate materials. This enables them to realise structures an individual could not achieve. Operating with more than one (mechanical) arm allows exploring assembly processes with multiple robots interacting on joint building tasks. The project Multi-Robotic Prefabrication investigates such cooperative robotic construction where multiple industrial robots assemble spatial metal structures consisting of discrete metal tubes. The project develops a construction method that relies on the alternate positioning of building members into triangulated configurations. The intricate geometric ependencies of the structural system, as well as the fact that the machines limit each other’s operational range, led to the exploration of robotic simulation and path planning strategies as an integral part of the computational design process. To explore the added architectural value of prefabrication with multiple interacting manipulators and to identify the novel structures that can be realised with it, the project is situated within a collaborative framework. It combines and integrates the development of computational architectural design, structural evaluation, robotic simulation and robotic prefabrication in the Robotic Fabrication Laboratory (RFL).