The Grim Math of Team Reliability

The bus factor measures how many key people must vanish before your project fails. If your critical work depends on only one person, your bus factor is just one.

This term sounds dark, but it is a vital tool for software teams and managers. It highlights the dangerous reality that losing a single essential expert can bring an entire organization to a standstill. Organizations strive to increase this number by encouraging knowledge sharing and documentation across teams. By spreading expertise, you protect the project from the unexpected disappearance of any individual.