AQL - Acceptable Quality Level

Abson uses the proven method of Acceptable Quality Level (or Acceptable Quality Limit) to conduct product inspection.

The standard definition of Acceptable Quality Level (AQL) is "the maximum defective percent (or the maximum number of defects per hundred units) that, for purpose of sampling inspection, can be considered satisfactory as a process average".

Basically, we will randomly select a sampling size quantity (based on the AQL tables) to be inspected, and after inspection, according to the number of defects found (critical, major, minor defects), we will advice you to accept or to reject your shipment.

In case of quality problems we will of course help you to determine the best actions and solutions to put in place, this is part of our services.

How to use the AQL Tables?

Table B:

Let's take a hypothetical inspection of a 30 000 pieces lot.

The Table A, under the column level II, gives us the letter M, which corresponds in the table B to a sampling size of 315 pieces to inspect. The usual AQL used by people is generally: 0 / 2.5 / 4 for Critical / Major / Minor defects. For the letter M, 315 pieces to inspect, the column 2.5 for defects gives us two numbers: 14 & 15. Thus Among a sampling size of 315 pieces inspected, the maximum number of major defects authorized is 14.

If we find 15 major defects, you should reject your shipment and / or perform defect sorting, ask for a re-work of the production or ask for a replacement of your production. Then you should get your shipment re-inspected a second time.

In the contrary, for these 315 pieces inspected, if we find less than 15 defective items, this means that there are 95% chances to have less than 5% (15/315) defects in the whole inspected lot.