Litebulbs,
I'm sure you could work out what you ought to be measured on. And it won't be safe planes - that's a given. I used to work in a factory in the North West that had the capability to take out all of Liverpool's population. All of them. We did not pay the engineers a bonus for not doing that. We would all have lost our jobs if the engineers had done it.
You can figure out who the top 10% of engineers are, and who the bottom 10% are. We all do it all the time.
It is just not fair to the majority for them to be held back by the slackers.