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What Is the Confidence Level when Working with AQL Tables?

August 1, 2019

What Is the Confidence Level when Working with AQL Tables?

A reader wrote to me and asked the following question about sampling plans by attributes: What is the "Confidence Level" when using the AQL Tables? How can we determine what the confidence levels are, and are there formulas we can use? That's a valid question. When playing with statistics, one often mentions a confidence interval. For example, "90% of the time, the value will be between 34.5 and 66.0". In theory, I guess one could do the same with the values in the AQL tables. There is a … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, Aql Tables, confidence level, confidence levels, quality inspections, quality inspectors, random aql inspection, random sampling aql inspection

When To Do a Random AQL Inspection vs. Check 100% of the Goods

April 5, 2019

When To Do a Random AQL Inspection vs. Check 100% of the Goods

First, let me get one thing out of the way: not all batches need to be checked. If a manufacturer has great systems and processes, and if they have a history of complying with your quality standard, there is usually no reason to send quality inspectors to their facility. Similarly, if you can easily return the whole batch and it can be reworked quickly, you probably don't want to spend resources on checking whether they did as promised. Now, let's assume you do want confirmation of … [Read more...]

Filed Under: Quality Control Tips Tagged With: 100% inspection, AQL, product inspections, qa, QC, quality inspections, random aql inspection, random sampling aql inspection


Weekly updates for professional importers on better understanding, controlling, and improving manufacturing & supply chain in China.

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This blog is written by Renaud Anjoran, an ASQ Certified Quality Engineer who has been involved in Chinese manufacturing since 2005.

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