Comparing PPM Year over Year - Determining the PPM decrease from 2009 to 2010

Jim Wynne

Staff member
Admin
#11
Well, if he is making millions of parts then there isn't an issue?
one of my product lines measures things in ppb. because we really are looking at billions. so I guess if I were measureing or making trillions I'd use ppt
No one will ever be able to convince me that measuring things in millionths makes sense when making 1000 pieces a week. I'm not even convinced that it makes sense when you are making millions of things when you can just say that x% of what we made was nonconforming.
It's not just the idea of PPM that's bothersome; it's the idea that because someone made 1000 of something and there were only 2 bad ones, that that proportion can rationally be projected out into infinity.
 
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