The frequency of occurrence of an unexpected characteristic or non-conformance is an important indication of possible root cause.
“Occasionally I get one of these parts with the drill going off-center.” While this sentence names the problem, it doesn’t give us much insight as to where to look- the drill I guess.
“I have about half a percent of the parts exhibiting an off-center drill feature on my six spindle,” gives us enough information to think that perhaps the first couple of inches of one bar on a stock up was crooked, resulting in the off-center drill.
Converting count to a percentage of production can help you prioritize where in your process to look for the likely cause.
Chemobabe the numbers girl.