Stamping out fires is a lot of fun, but it is only putting things back the way they were.
A rule should suit the purpose.
It is a mistake to assume that if everybody does his job, it will be all right. The whole system may be in trouble.
Just because you can measure everything doesn't mean that you should.
You must have a supplier relationship of constant improvement.
The most important figures for management of any organization are unknown and unknowable.