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jackylpt
Does anybody know what is difference between DPMO and PPM? thanks.
jackylpt said:Does anybody know what is difference between DPMO and PPM? thanks.
So another way of saying it is DPMO = PPM/# of opportunities per part?wmarhel said:DPMO = Defects per Million Opportunities
PPM = Parts per Million (could also be DPM)
Think of PPM/DPM as a binary result, it is either a PASS or FAIL condition. A unit/part/service is acceptable to the customer, or it isn't. So if 10 units out of a hundred failed, your PPM would be: (10/100)*1,000,000 = 100,000 PPM.
DPMO is looking at opportunity failures. In this instance, each unit could potentially fail from 10 different causes. I'm not a huge fan of this line of thinking except when looking at it from a design/new product introduction standpoint. Here's a thread where there is more discussion on the topic:
DPMO for Testing Stations.
Wayne
Statistical Steven said:So another way of saying it is DPMO = PPM/# of opportunities per part?