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Why the AQL Inspection System Is Still So Widespread

March 21, 2023 by Renaud AnjoranLeave a Comment

Why the AQL Inspection System Is Still So Widespread

In the 1930s, some smart statisticians at Bell Labs worked on an amazing amount of manual calculations to suggest sampling plans for product quality inspections. Over time, it became the topic of MIL STD standards and one of those plans … [Read more...]

Filed Under: Quality Control Tips Tagged With: 100% inspection, AQL, random sampling aql inspection

6 Tips To Combat Common Recurring Quality Issues From Your Supplier

February 24, 2023 by Renaud Anjoran

6 Tips To Combat Common Recurring Quality Issues From Your Supplier

What happens if your supplier keeps manufacturing products with various defects, even though you have a quality standard that outlines your expectations? This tends to happen for the same reasons, so here are 6 tips to help you avoid … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, design defects, manufacturing defects, product quality

Using the Limiting Quality Level (ISO 2859-2:2020) Instead of AQL

September 19, 2022 by Renaud Anjoran

Using the Limiting Quality Level (ISO 2859-2:2020) Instead of AQL

A reader asked me how he should do an inspection of a lot produced in isolation. In theory, he should work with the Limiting Quality Level (LQ), not the AQL, which is designed for inspections of a continuous stream of production. I shot … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, limiting quality level, LQ, product inspections, random inspection

Inspecting Productions with Very Few Defects: Dump the AQL

May 11, 2022 by Renaud Anjoran

Inspecting Productions with Very Few Defects: Dump the AQL

The topic of "do we really need to send inspectors to check productions" and "does that whole AQL concept even make sense" are frequently raised. In this article, I want to write about what it takes to get to a very low rate of defective … [Read more...]

Filed Under: Process Improvement Tagged With: AQL, product inspections, zero defects

Renaud Answers YOUR Manufacturing Questions [Podcast]

April 1, 2022 by Adrian Leighton

Celebrating 100 Episodes By Answering YOUR Questions [Podcast]

In this episode… To celebrate our 100th episode over on Sofeast's podcast Renaud called on listeners for their manufacturing-related questions and answered as many as possible!  They're questions that are relevant to so many importers, … [Read more...]

Filed Under: Good Articles Tagged With: AQL, manufacturing agreement, product inspections, QC, raw material cost rises, supply chain risks

What Is the Confidence Level when Working with AQL Tables?

August 1, 2019 by Renaud Anjoran

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 … [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

A Simple AQL Calculator To Prepare Your Product Inspections

May 13, 2019 by Renaud Anjoran

A Simple AQL Calculator To Prepare Your Product Inspections

One of our developers prepared this simple AQL calculator for Sofeast. You can use it instead of reading the AQL tables to quickly produce your sample size and permissible defect number. … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, aql calculator, aql limit, Aql Tables, product inspections, QAQC, quality inspections, random aql inspection

100% Inspection in a Third Party Facility in China: The How-To

April 30, 2019 by Renaud Anjoran

100% Inspection in a Third Party Facility in China: The How-To

I am guessing that about 96% of quality inspections done in China, on behalf of overseas buyers, are conducted in the supplier's facility on a set of randomly-picked samples. About 3% are done at the supplier's facility, on 100% of the … [Read more...]

Filed Under: Quality Control Tips Tagged With: 100% inspection, AQL, FBA sellers, random inspection, third party inspection facility

The Special Inspection Levels in the AQL Tables

April 9, 2019 by Renaud Anjoran

The Special Inspection Levels in the AQL Tables

A few years ago I wrote about the inspection levels, but I regularly notice that some people are confused about the "special" levels (S1, S2, S3, and S4). Here is what the ISO 2859-1 standard says (emphasis is mine): The inspection … [Read more...]

Filed Under: Quality Control Tips Tagged With: AQL, Aql Tables, inspection levels, special inspection levels

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

April 5, 2019 by Renaud Anjoran

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 … [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

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

This is the official blog of Sofeast.com.

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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