When the system you're responsible for is just one of the many gears in the system, the first thing that you must do when the system fails is ask.. Is it our fault? Never think of blaming the other bits of the system first before confirming that your role in the system is performing as expected. Because somewhere out there people responsible for the other parts of the system will be saying it's YOUR FAULT the system failed and you want to be ready to answer them back with why it ISN'T the case.