A breath of fresh air

摘要

It was a quiet day when my manager came to me with an urgent request. Our most recent quality numbers showed a significant regression, causing the failure rates of our control boards to more than triple in three months! As this fact became better known, the number of fingers pointing at the engineers to fix this issue increased exponentially. Management assigned a team of engineers to look for anything that could have changed. Did we make any component or process changes? Was the regression within normal statistical variation?