This article introduces the different AQL inspection levels available to buyers. Those levels are mentioned in the ISO 2859-1 standard (or its American equivalent, ANSI/ASQC Z1.4). Let’s explore the different levels of random … [Read more...]
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...]