Traditional Hub-Spoke carries one fatal assumption: the Hub is always online. But in a disaster zone, when the Hub goes down, patients cannot wait. xGrid designs for disconnection as the normal state — every node is a complete system, and any one of them can take over.
Most medical systems treat offline mode as degradation. xGrid treats it as the default. When your deployment site has no cell towers, no routers, and no IT staff, every design decision starts from zero connectivity.
Safety-I asks how things go wrong. Safety-II asks how things go right. Here's how xGrid puts Safety-II's four design principles into practice in disaster medicine.
The software industry's 'bus factor' thought experiment, pushed to the extreme in disaster medicine. How xGrid passed all five Walkaway Tests to reach bus factor approaching infinity.
