TS ISO 2859-4
Sampling procedures for inspection by attributes - Part 4: Procedures for assessment of declared quality levels
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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About This Item
TS ISO 2859-4 defines single sampling plans for checking a declared quality level by inspection of a sample. It is intended for situations where a lot, process output, inventory, file, or similar population must be assessed against a stated quality value; unlike other parts of the ISO 2859 series, it is not used for acceptance assessment of lots.
How the declared quality level is assessed
In general technical terms, the standard supports objective evidence about a whole population by examining randomly selected individual items instead of inspecting every item. ISO 2859-4 provides plans for four levels of discriminatory ability, and each sampling plan is given with a limiting quality ratio (LQR) for reference. The document is therefore centred on judging whether the observed sample supports or contradicts a declared level of quality rather than on making a classic accept/reject decision for a lot.
Risk control and typical use cases
The procedures focus mainly on controlling type I error. For levels I to III, the plans are designed so that the risk of contradicting a correct declared quality level is no more than 5%. The risk of failing to contradict an incorrectly declared quality level, as related to the LQR, is no more than 10%. For level 0, the sample sizes are chosen so that the LQR factors remain compatible with those of level I. This makes the standard relevant to quality surveillance, process monitoring, and other inspection settings where sampled evidence is used to support a declared quality claim.
- Provides single sampling plans.
- Covers four levels of discriminatory ability.
- Includes the LQR as a reference value.
- Not intended for lot acceptance assessment.
- Publication Date: 15.02.2021
- Standard Status: U (Yürürlükteki Standard/Standard)
- Publisher: TSE
- Document Language: en
- ICS Classification: 03.120.30 İstatistiksel Metotların Uygulanması
- Pages: 29
- Source Standard: ISO 2859-4:2020
- International Equivalents: ISO 2859-4-EQV
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