Mike,
David Mullins:
...systems that don't rely on people...
I think what David was trying to say was don't rely on people to do it correctly. Make the process robust. (Correct me if I'm wrong Dave!)
The point I was making was if the process
allowed the operator to make an error, then there is something wrong with the process, not the operator. It is important to point the finger at the process and not the person working on it.
For that reason alone, I reject all CAR's with Operator Error, unless they can give me a plausible explanation (which they haven't to date).
Now, let me qualify where I am coming from. I work in the automotive industry so I can only speak from my experiences there. For other industries, perhaps my statement was a bit of 'shooting from the hip'. (Maybe Marc could offer a 'foot in the mouth' smilie for just such a thing

)
I hope this clarifies my thoughts...