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BS 6001-1-1999+A1-2011 ISO 2859-1-1999
This second edition of ISO 2859-1 cancels and replaces the first edition (ISO 2859-1:1989) of which it constitutes a technical revision.
Significant changes in this edition include:
— a new procedure for switching from normal to reduced inspection;
— a reference to skip-lot sampling as an alternative to reduced inspection;
— the term "limiting quality" has been changed to "consumer's risk quality" in the heading of Tables 6-A, 6-B, 6-C, 7-A, 7-B and 7-C;
— a new table has been added giving producer's risk as the probability of rejection of lOTS with percent nonconforming equal to the AQL;
— optional fractional acceptance number plans have been added; the purpose of these plans is to provide a consistent progression from the plans for acceptance number zero to the acceptance number 1 plans. The fractional acceptance number plans are found in Tables 11-A, 11-B and 11-C, where they take the place of the arrows in the corresponding positions in tables 2-A, 2-B and 2-C;
— reduced plans have been changed to eliminate the gap between the acceptance and rejection numbers;
— some changes have been made to the double sampling plans to provide a smaller average sample size;
— multiple sampling plans have been changed to five stages rather than seven. The change has not increased the average sample size. Some of the new plans have a smaller average sample size than their counterparts in the previous edition;
— scheme operating characteristic curves have been added as Table 12.
ISO 2859 consists of the following parts, under the general title Sampling procedures for inspection by attributes:
— Part 0: Introduction to the ISO 2859 attribute sampling system
— Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection
— Part 2: Sampling plans indexed by limiting quality (LQ) for isolated lot inspection
— Part 3: Skip-lot sampling procedures
It is highly recommended that this part of ISO 2859 be used together with ISO 2859-0, which contains illustrative examples.
Annex A of this part of ISO 2859 is for information only. |
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