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A supplier is compressions molding a silicon part. For this production process I am thinking of creating/ calculate PPM (Parts Per Million). Since supplier manufacturer 10,000 to 20,000 parts per lot, its not feasible to visually check every part in the lot for defective units to calculate the PPM Can you give me guidelines on selecting samples from the lot to calculate the PPM.
Q 78. DPMO (Defects Per Million Opportunities) is used as an alternative to PPM (Parts Per Million Defective). For customers, defective items or Non- Conforming outcomes is a prime concern and they have penalty clauses based on PPM. Companies sometimes prefer to use DPMO instead of PPM as a measure of process performance. Explain specific situations where DPMO is a better measure as compared to PPM and vice versa. Note for website visitors - Two questions are asked every week on this platform. One on Tuesday and the other on Friday. All questions so far can be seen here -