Category Archives: Z1.4 & Z1.9 – 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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Zero Acceptance Number Sampling Plans and the FDA

Question There has been some debate over using the MIL-STD-1916 acceptance sampling plan over the ANSI/ASQ Z1.4-2003 (R2013) sampling plans.  The opinion is that the ANSI/ASQ Z1.4-2003 (R2013) is outdated and no longer an acceptable method of determining a qualification … Continue reading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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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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Switching Rules

Question  We are planning to implement ANSI/ASQ Z1.4-2003(R2013) sampling inspection plan with our Finish products which are currently 100% inspected by QC Inspectors.  I read  about the importance of the switching rules  on a continuing stream of lots and have the … Continue reading

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Sample Size and Z1.4

Question My question is if I’m trying to determine the sample size of migrated data to see if it migrated correctly to the target database, is the Z1.4 table applicable to that? The scenario is data is being transferred from … Continue reading

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