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 products and keeps shipping them regularly (e.g. twice a month) to the same customer. As a consequence, the assumption is that quality is under control. And an inspection is used to catch the big accidents. What it means is that the statistics are way, way … [Read more...]
What is an inspection level in ISO 2859-1 and ANSI/ASQ Z1.4?
This article introduces the different options available to buyers when it comes to the representativity of inspection findings. Inspection level II (under "normal severity") is appropriate for most inspections. But it is sometimes necessary to increase--or reduce--the number of samples to check. … [Read more...]