⑴ Considering the severity of the impact of nonconformities on product performance, in the same acceptance sampling problem, it is generally required that the AQL value of Class A nonconformities (products) is less than the AQL value of Class B nonconformities (products); The AQL value of Class B nonconforming products is less than that of Class C nonconforming products. For example, AQL values of Class A, B and C nonconforming products are 0.15, 0.40 and 0.65 respectively.
(2) AQL cannot tell the user how much quality protection can be obtained for a single batch of products. In order to clarify the quality protection for the user, it is necessary to check the OC curve of the one-time sampling scheme for design values given in Figure 1 to Figure 11 of GB 2828 and its corresponding value table.
(3) The determination of AQL value depends on the compromise between the quality that the manufacturer may provide and the quality that the user thinks is ideal. That is, it is a compromise quality between the quality that the user hopes and the quality that the user can afford at cost. The stricter the quality requirements are, the more difficult the manufacturer is to meet them, and the higher the inspection fee is, which ultimately must be calculated on the product.
⑷ AQL value is not specified for each batch, but is specified by the responsible department (or person in charge) in the contract. Once specified, it cannot be changed at will.