DPMO vs. DPM?
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- This topic has 3 replies, 3 voices, and was last updated 21 years, 6 months ago by
Cone.
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February 18, 2001 at 5:00 am #65844
Joe PeritoParticipant@Joe-PeritoInclude @Joe-Perito in your post and this person will
be notified via email.I would describe the difference between the two as one being a “Macro” , the other a “Micro”, and the difference between the two a matter of “control”. If a TV factory has 5 bad TV’s in an eight hour shift, this might be macro information but does not include any details. It not useful for comparing efficiencies. One department may only be able to experience one type of failure and rework the 5 bad TV’s. Their DPM might be 5 PPM if a million TV’s were made. The next department may install several components and the possible number of failures may be a multiple of the series of components, or if the elctronic components are in parallel circuits, or the failures could be inter-related or combinations of failures, the rework may be double, times five, or based on the probability of component failure combinations. The failures (and required rework) may be many times the level of the previous department based on the “Defects per million opportunities)… and yet only 5 TV’s are involved. To compare the efficiencies throughout the company and to know whether quality is getting better or worse department by department, you need the DPMO information for tracking and contolling the efficiency, or quality ouput, (including the amount of waste and rework, of each department.
0February 18, 2001 at 5:00 am #27072
Kim NilesParticipant@KnilesInclude @Kniles in your post and this person will
be notified via email.I am researching the six sigma program integration
of opportunity divisible defect metrics for my class at CSUDH. Does anyone have any comments or direction for me regarding the implications and or ramifications of DPMO vs. DPM, etc.?Thanks,
KN – http://www.znet.com/~sdsampe/kimn.htm0February 20, 2001 at 5:00 am #65854
Kim NilesParticipant@KnilesInclude @Kniles in your post and this person will
be notified via email.Thanks Joe:
That was just what I was looking for.
What bothers me about the DPMO is that the results appear to be subjective as one could change them at a whim depending upon what and how many “defect opportunities” they decide to use.
Am I missing something?
Are there any guidelines on opportunity selection and maintenance?
KN
0February 22, 2001 at 5:00 am #65872It is not defect opportunities, that could infinite. Opportunities are the value added things that must go right for the product to be right. Six Sigma and Lean are focused on only doing necessary things right.
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