Tag Archives: AQL

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 for Electricity Meter Testing

Q: We have implemented a program to test electricity meters that are already in use. This would target approximately 28,000 electricity meters that have been in operation for more than 15 years. Under this program, we plan to test a … Continue reading

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ISO 2859-3 Skip-lot Sampling 5.1.1 & 5.2.1

Q: Our quality team is trying to improve inspection efficiency and enhance supplier management by employing ISO 2859-3:2005 Sampling procedures for inspection by attributes — Part 3: Skip-lot sampling procedures. Here are two questions on product qualification related to clause 5.2.1 Generic … Continue reading

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Operational qualification (OQ) challenges; Cpk v.s. AQL

Q: We’re completing a validation of a plastic extrusion process, which has raised a few questions with me.  This validation exercise encompasses the installation qualification (IQ), operational qualification (OQ), and the performance qualification (PQ). The IQ is self explanatory, but the … Continue reading

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Z1.4 2008: AQL, nonconformities and defects explained

Q: My question is regarding the noncomformities per hundred units and percent nonconforming.  This topic is discussed in ANSI/ASQ Z1.4-2008 Sampling Procedures and Tables for Inspection by Attributes under sections 3.2 and 3.3 on page 2.  Regardless of the explanations … Continue reading

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