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This International Standard specifies
sequential sampling plans and procedures for
inspection by attributes of discrete items.
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 2859-1.
The purpose of this International Standard is to
provide procedures for 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.
Sampling procedures for inspection by attributes — Part 4: Specification for sequential sampling plans