Choosing AQL's and sampling plans.

CFR · 2024-01-01 · US · Title 7

(a) The selection of AQL's and sampling plans for given lot sizes depends on too many factors to permit the issuance of a “pre-selected” standard set of plans for specified lot sizes. Each user of the standards of this subpart should select AQL's and sampling plans that are tailored to best meet his needs. (b) Some of the factors that must be considered prior to selecting the AQL's are: (1) Class of defects such as major and minor: Major defects would generally require lower AQL's than those for minor defects; (2) Process capabilities under good commercial practice with respect to the defects in question: For example, if under normal production processes, the defect level cannot be kept below 2.0 percent defective, the selection of an AQL of 0.15 percent defective, although desirable for the defects in question, may not be practical; (3) Consumer preferences: These may require higher AQL's or permit lower AQL's than process capabilities would indicate; and (4) Time and cost required to sample and inspect a lot under various AQL's: The smaller the AQL the more time and cost of inspection. (c) Some of the factors that may be considered prior to selecting the sampling plans for given lot sizes are: (1) The applicable AQL(s): The AQL dictates, among other things, the smallest sample size that can be used and the size of the “jumps” from one sample size to the next larger one; (2) The relative ability of the plans to discriminate between “good” and “bad” lots: Although several pla

official document · source cfr-2024 · id 7:§ 43.106