Category Archives: Sampling

DPPM Calculation

Question Recently, there is a debate in my organization about Defective Parts Per Million (DPPM) computation. Camp 1 – DPPM = (No of parts rejected / No of parts inspected) * 1,000,000 Camp 2 – DPPM = (No of parts … Continue reading

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AQL Clarifications

Question I am confused about the values used for AQLs. For example in Table II-A the AQL values range from 0.010 to 1000. Where do these values come from and what do they mean? The table states, “AQLs, in Percent … Continue reading

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DPMO

Question My question concerns the process performance metric DPMO (defects per million opportunities). I want to use this to quantify a particular supplier’s performance. My question is, is the number of defects referred to in the calculation the number of … Continue reading

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Z1.4 Sample Size

Question I am trying to determine the sampling size using my ANSI/ASQ Z1.4 table and I wanted to get some clarification. If I am using Table II A and my Sample Size Code letter is D, what would be my … Continue reading

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Acceptance Sampling Inspection

Question We have an Acceptance sampling inspection in place where we use the ANSI/ASQ Z1.4 – 2013 standard under Normal Inspection, using General Inspection Level II to drive our samples size and accept, reject criteria. We do not uses switching … Continue reading

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Sampling and Daylight Savings Time

Question We are wondering if there is any generally accepted procedure to account for seemingly duplicate sample times when operating over the time period when clocks ‘fall back’ one hour for the end of daylight savings time? Our standard practice … Continue reading

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Sampling

Question Is there a sampling plan for determining the number of cases to pull in a batch from which you perform the ANSI/ASQ sampling of individual products?  For example: you receive 550 cases with 145 product vials/case.  Is it proper … Continue reading

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