The really interesting lesson that engineers have learned from the Patriot is that "never reboot" might not be the best target for critical systems. Rather, controlled rebooting can help clean up problems before they affect the function of the system.

http://portal.acm.org/citation.cfm?id=1251254.1251257 http://www.computer.org/portal/web/csdl/doi/10.1109/HOTOS.20...