• Journal of Korean Society for Quality Management
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• v.52 no.3
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• pp.395-412
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• 2024

Purpose: ISO (International Organization for Standardization) has published the third edition of ISO 3951-1:2022, Sampling Procedures for Inspection by Variables-Part 1. ISO 3951-1 is an AQL (Acceptable Quality Limit) type sampling scheme, and incorporates switching rules to move among normal, tightened, and reduced inspections. This paper examines the contents of ISO 3951-1:2022 and analyzes its characteristics. Methods: The contents of ISO 3951-1:2022 and ISO 3951-1:2013 (the second edition of ISO 3951-1) are compared and analyzed in detail. The comparisons of ISO 3951-1:2022 and ISO 2859-1:2013 (the latest edition of Sampling Procedures for Inspection by Attributes-Part I) are also performed. Results: The main changes of ISO 3951-1:2022 are as follows: i) procedures have been introduced to accommodate measurement uncertainty, ii) many of sampling plans are adjusted to improve the match between their OC (operating characteristic) curves and the OC curves of the corresponding plans of ISO 2859-1, iii) the form p* for determining the acceptance of the lot is extended to all ranges of AQL and code letter values. Conclusion: ISO 3951-1:2022 cancels and replaces ISO 3951-1:2013, which has been technically revised. KS Q ISO 3951-1:2019 that is Korean version of ISO 3951-1 was established as a Korean standard by conforming to ISO 3951-1:2013. Therefore, we need to revise it to ISO 3951-1:2022, as soon as possible.

• Journal of Korean Society for Quality Management
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• v.23 no.1
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• pp.1-14
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• 1995

ISO 3951 (1989) Sampling Procedures and Charts for Inspection by Variables for Percent Nonconforming is an acceptable quality level (AQL) type sampling scheme. Sample size code letters and inspection levels in this International Standard correspond to those given in the ISO 2859 (1989), a standard for sampling plans by attributes. Two acceptance sampling procedures can be used ; tabular and graphical methods. The graphs could be used in less critical applications while the tabular method would be available for those familiar with MIL-STD-414 tables and to confirm the results of the graphs when needed. The sampling procedures of the ISO 3951 are matched to the ISO 2859 to enable us to move between them. Composite OC and ASN curves are given for AQL 2.5% and code letter F.

• Journal of Korean Society for Quality Management
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• v.24 no.3
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• pp.77-93
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• 1996

This paper is concerned with the International Standard ISO 2859-1 (1989), Sampling Plans Indexed by Acceptable Quality Level (AQL) for Lot-by-Lot Inspection, his standard is AQL type sampling scheme, and incorporates switching rules to move among normal, tightened, and reduced inspections. Sample size code letters and inspection levels of ISO 2859-1 are the same as those of other attributes standards MIL-STD-105D, ANSI Z1.4, and KS A 3109. But ISO 2859-1 has more simple switching rules than KS A 3109 has. The sampling procedures of the ISO 2859-1 are matched to the variables international standard ISO 3951 to enable us to move between them. Composite OC and ASN curves are given for AQL 2.5% and code letter F.

• Proceedings of the Safety Management and Science Conference
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• 2008.11a
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• pp.517-526
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• 2008

This paper introduces fourteen single, double, multiple and sequential acceptance sampling plans based on switching rule. Revised KS standards for acceptance sampling by attribute and by variable such as KSA ISO 2859-0, 1:2001 2859-2:2001, 8422:2001, 3951:2006, 8423:2001, MIL-STD-105E:1989, 414:1968 and ANSI/ASQ Z1.4, Z1.9:2003 are presented.

• Journal of Korean Institute of Industrial Engineers
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• v.16 no.1
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• pp.1-15
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• 1990

An AQL type variables sampling system with switching rules is proposed. Comparative studies of existing variables sampling standards - MIL-STD-414, ANSI Z1.9, ISO 3951, and BS 6002 - are made, and simulation studies on switching procedures are conducted. Based on comparative and simulation studies, a variables sampling standard for Korean industry is proposed. The master sampling tables of the proposed standard are taken from the variables standard ANSI Z 1. 9 and the switching rules are matched to the attributes standard KS A 3109 to enable us to move between the proposed variables standard and KS A 3109. Composite OC and ASN curves of the proposed standard are calculated for selected combinations of lot sizes and AQL's and they are compared with those of ANSI Z1.9.