Buyers often ask us, how to do quality inspections in “stricter” way with some of their suppliers in China or Vietnam. 1) An easy way is to set reduce AQL limits, but the supplier might refuse. I know of a large company that sets … [Read more...]
AQL 2.5 Has Nothing to Do with the Number of Samples to Inspect
It seems like most suppliers and most buyers can only remember "AQL 2.5" when it comes to the settings of QC inspections. Unfortunately, "Sampling as per AQL 2.5" means nothing. I am aware that "single sampling plan by attributes as per … [Read more...]
How many defects are still in a batch after an AQL inspection?
A client asked me an interesting question: If we base on AQL, how many pcs with defects will still be in bulk when shipping ? In other words, the inspectors find some defects during a random inspection, and these defects are supposed to … [Read more...]
Common questions about what an AQL inspection guarantees
Recently I got 4 messages from buyers who asked me to clarify what an AQL inspection guarantees and what it does not guarantee. The problem is, explaining the concept of the AQL (Acceptance Quality Limit) is not simple. Here are two … [Read more...]
Why the AQL tables are not in favor of the buyer
This is the third and last video about the ANSI tables (also known as “AQL tables”). As I explained in the last video, these sampling schemes were designed for very stable relationships, where the manufacturer keeps making the same … [Read more...]
When Applying the AQL tables Does or Doesn’t Make Sense
Here is the second video about the ANSI tables (also known as “AQL tables”). The previous video is here. These statistics were designed for a very specific case, and most buyers are not aware of this. As a consequence, they apply these … [Read more...]
QC Inspections: How to Read the AQL Tables
I have prepared a few videos that explain how to use the ANSI tables (also known as "AQL tables"). Here is the first one. In less than 7 min, it will show you: How to find the number of samples to check; What the AQL limits are … [Read more...]
Limits of QC inspections based on AQL & random sampling
I wrote many times that QC inspections before shipment are a good way of keeping quality problems where they belong: in the factory. It is a good tool. But pointing to its limits is important. Misinterpreting its reliability is very … [Read more...]
How to choose an AQL limit?
A few months ago, I wrote an explanation about the "AQL": what it is and how to use it. I also listed a few frequent questions, but it seems like I forgot one of them: What AQL tolerance is suitable to my products? Unfortunately, it is … [Read more...]
Near Sourcing Benefits: Buying from Europe & Turkey VS China
Suppose you're buying products from China now and thinking about near sourcing to diversify your pool of suppliers and take advantage of the benefits of working with closer suppliers. In that case, this post is a good … [Read more...]
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