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The frequency of occurrence of an unexpected characteristic or
non-conformance is an important indication of possible root
cause.
When
you tie frequency of occurrence numbers back to the process you can gain some
insight into what just may be the 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.
If you can do the math, you can uncover the root
cause.
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.
Editor's Note: CR4 would like to thank Milo for sharing this blog entry, which originally appeared here.
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Re: Using Frequency of Occurrence to Find Root Cause
