I had a failure where the root cause was the material handler failed to follow the procedure of comparing ID's of stock brought to a machine with what was set up and running at the machine. Parts look the same at this point except for a large ID stamped into the part. All loads,samples and work instructions were clearly and correctly marked and handler also has a copy of the daily schedule. He said he knew what part was going in but failed to notice what the machine was set up for. He follows procedures 99.9% of the time but this .01% may cost 10K. I don't like to use operator failure as a root cause but in this case I don't see it as anything but. Guess my question is are there times where we just except human error and that there is not *always* a corrective action for it?