标准编号：ISO 2859-4:2020
中文名称：计数检查的抽样程序 第4部分：规定质量水平的评价程序
英文名称：Sampling procedures for inspection by attributes — Part 4: Procedures for assessment of declared quality levels
发布日期：2020-06
标准范围
This document establishes single sampling plans for conformance testing, i.e., for assessing whether
the quality level of a relevant audit population (lot, process, inventory, file etc) conforms to a declared value. Sampling plans are provided corresponding to four levels of discriminatory ability. The limiting quality ratio (LQR) (see Clause 4) of each sampling plan is given for reference. For levels I-III, the sampling plans have been devised so as to obtain a risk no more than 5 % of contradicting a correct declared quality level. The risk of failing to contradict an incorrectly declared quality level which is related to the LQR is no more than 10 %. The sample sizes for level 0 are designed in a way that the LQR factors of the sampling plans are compatible with the LQR factors for level I.
In contrast to the procedures in the other parts of the ISO 2859 series, the procedures in this document are not applicable to acceptance assessment of lots. Generally, this document mainly focuses on controlling type I error, which differs from the balancing of the risks in the procedures for acceptance sampling.
This document can be used for various forms of quality inspection in situations where objective
evidence of conformity to some declared quality level is to be provided by means of inspection of a
sample. The procedures are applicable to entities such as lots, process output, etc. that allow random
samples of individual items to be taken from the entity.
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