Systems failures are inevitable as complexity and meshness grows in any open system. The greater the interdependencies, the higher the potential for outage. What happened in the latest Telstra systems failure? Was it a system fault? Was it human error? Increasingly it is difficult to identify what goes wrong in such systems or subsystems.
Citation: Katina Michael, March 23, 2016, "The Telstra Systems Failure: Complex Systems & Interdependencies", ABC Adelaide, 5.50pm.