T
tww11
I keep getting conflicting information on DPMO. The key word being OPPORTUNITIES. I think people are confusing DPMO and PPM. Some people think it tells them how many parts out of 1million have defects, but we are not measuring parts defective in DPMO. Does the 1,000,000 in PPM mean 1 million parts and the 1,000,000 im DPMO means 1 million opportunites?
Here is my interpretation:
1000 units, 5 defects, 2 opportunites for defects per unit
1000 units X 2 opps per unit= 2000 total opportunities
5 defects / 2000 total opportunities= .0025
So, every opportunity shares .0025 of a defect.
Now, I take .0025 X 1,000,000 opportunites (not parts)= 2500 defects per million opportunites
This tells me nothing about the amount of parts that have defects. That is what PPM is for. This only tells me how many defects I will have over 1million opportunities. Is this right?
Here is my interpretation:
1000 units, 5 defects, 2 opportunites for defects per unit
1000 units X 2 opps per unit= 2000 total opportunities
5 defects / 2000 total opportunities= .0025
So, every opportunity shares .0025 of a defect.
Now, I take .0025 X 1,000,000 opportunites (not parts)= 2500 defects per million opportunites
This tells me nothing about the amount of parts that have defects. That is what PPM is for. This only tells me how many defects I will have over 1million opportunities. Is this right?