BS 6002-4.1: 1994 ISO 8423:1991 : Sampling procedures for inspection by variables — Part 4: Specification for sequential sampling plans for percent nonconforming — Section 4.1 Known standard deviation
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This International Standard specifies
sequential sampling plans and procedures for
inspection by variables of discrete items. It is
complementary to ISO 8422. The plans in the main
body of the standard are indexed in terms of the
producer’s risk point and the consumer’s risk point.
Annex A specifies sequential sampling plans and
procedures indexed in terms of the acceptable
quality level (AQL) to supplement the system of
sampling plans in ISO 3951.
The purpose of this International Standard is to
provide procedures based on a sequential
assessment of inspection results, that may be used
to induce the supplier through the economic and
psychological pressure of non-acceptance of lots of
inferior quality to supply lots of a quality having a
high probability of acceptance. At the same time the
consumer is protected by a prescribed upper limit to
the probability of accepting lots of poor quality.
BS 6002-4.1: 1994 ISO 8423:1991 : Sampling procedures for inspection by variables — Part 4: Specification for sequential sampling plans for percent nonconforming — Section 4.1 Known standard deviation
