BS 6001-9:2002 - Sampling procedures for inspection by attributes. Double sampling plans using minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ) – BSI British Standards

BS 6001-9:2002

Sampling procedures for inspection by attributes. Double sampling plans using minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)

Status : Superseded, Withdrawn   Published : September 2002 Replaced By : BS ISO 28801:2011, BS 6001-9:2011

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This British Standard provides double sampling plans by attributes for the acceptance inspection of lots of discrete items. The plans are indexed by the producer’s risk quality (PRQ) and the consumer’s risk quality (CRQ) where the nominal risks are either 5 % or 10 %. Plans are provided for inspection for percent nonconforming and for inspection for nonconformities per 100 items. The lot is acceptable if there are no nonconforming items (nonconformities) in the first random sample, and not acceptable if it contains two or more nonconforming items (nonconformities). If precisely one nonconforming item is found in the first sample, a second random sample is drawn; the lot is then acceptable if the second sample contains no nonconforming items (nonconformities) and not acceptable otherwise.

The objective of this standard is to provide procedures that enable lot disposition to be determined quickly and economically if quality is particularly good or bad. For intermediate quality a second sample is drawn in order to be able to discriminate more reliably between acceptable and unacceptable lots. The two sample sizes are chosen to minimize the maximum expected sample size with respect to incoming quality subject to the nominal risks not being exceeded.

Similarly, the plans may be used to test the hypothesis that a lot or process quality level is equal to the PRQ (i.e. acceptable) against the alternative hypothesis that the quality level is equal to the CRQ (i.e. unacceptable).

The plans are preferable to single sampling plans where the cost of inspection is high, where the delay and uncertainty caused by the possible requirement for second samples is inconsequential and where a relatively large ratio of the consumer’s risk quality to the producer’s risk quality can be tolerated.

The plans are suitable for isolated lots or for short series of lots, where the sum of the two sample sizes is no larger than about 10 % of the size of the lot. The plans are also suitable for continuing series of lots when lots that fail to satisfy the acceptance criteria are 100 % inspected and all nonconforming items replaced by conforming items; however, for continuing series of lots, consideration should also be given to using double sampling plans from BS 6001-1.




Standard NumberBS 6001-9:2002
TitleSampling procedures for inspection by attributes. Double sampling plans using minimal sample sizes, indexed by producer's risk quality (PRQ) and consumer's risk quality (CRQ)
StatusSuperseded, Withdrawn
Publication Date20 September 2002
Confirm Date01 October 2008
Withdrawn Date30 April 2011
Normative References(Required to achieve compliance to this standard)No other standards are normatively referenced
Informative References(Provided for Information)No other standards are informatively referenced
Replaced ByBS ISO 28801:2011, BS 6001-9:2011
ReplacesBS 2635:1955
Draft Superseded By01/402851 DC
DescriptorsInspection by attributes, Acceptance inspection, Samples, Sampling methods, Quality control, Quality assurance, Acceptance (approval), Surveillance (approval), Quality assurance systems, Sequential sampling, Sampling tables, Statistical quality control, Probability calculations
ICS03.120.30
CommitteeSS/5
ISBN0 580 38991 X
PublisherBSI
FormatA4
DeliveryNo
Pages56
File Size5.268 MB
Price£240.00


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