BS 6002-2:2007 - Sampling procedures for inspection by variables. General guide to single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics – BSI British Standards

BS 6002-2:2007

Sampling procedures for inspection by variables. General guide to single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics

Status : Superseded, Withdrawn   Published : February 2007 Replaced By : BS ISO 3951-2:2013

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BS 6002-2:2007 describes an acceptance sampling system primarily designed for use under the following conditions:

a) where the inspection procedure is to be applied to a continuing series of lots of discrete products all supplied by one producer using one production process;
b) where the quality characteristics of the items of product are measurable on a continuous scale;
c) where the measurement error is negligible (i.e. with a standard deviation no more than 10% of the corresponding process standard deviation);
d) where production is stable (under statistical control) and the quality characteristics are distributed, at least to a close approximation, according to normal distributions;
e) where, in the case of multiple quality characteristics, the characteristics are independent, or almost independent, of one another;
f) where a contract or standard defines a lower specification limit U, an upper specification limit L, or both on each of the quality characteristics. If there is only one quality characteristic, an item is qualified as conforming if its measured quality characteristic x satisfies the appropriate one of the following inequalities:
   1) x W L (i.e. the lower specification limit is not violated);
   2) x u U (i.e. the upper specification limit is not violated);
   3) x W L and x u U (i.e. neither the lower nor the upper specification limit is violated).

If there are two or more, say m, quality characteristics, then, designating the lower and upper limits for the ith quality characteristic by Li and Ui respectively, an item of product is qualified as nonconforming if one or more of its m measured quality characteristics xi fails to satisfy the appropriate one of the following inequalities:
   4) xi W Li;
   5) xi u Ui;
   6) xi W Li and xi u Ui.

Inequalities 1), 2), 4) and 5) are called cases with a single specification limit, and 3) and 6) are called cases with double specification limits. For double specification limits, a further distinction is made between combined control, separate control or complex control. If there is only one quality characteristic, then: 

  • combined control is where a single AQL applies to nonconformity beyond both limits
  • separate control is where separate AQLs apply to nonconformity beyond each of the limits
  • complex control is where one AQL applies to nonconformity beyond the limit that is of greater seriousness, and a larger AQL applies to the total nonconformity beyond both limits.

If there are two or more quality characteristics, this generalizes as follows:

  • combined control is where nonconformity beyond both limits on a variable belongs to the same class, to which a single AQL applies
  • separate control is where nonconformity beyond the two limits on a variable belongs to separate classes, to each of which a single AQL applies
  • complex control is where nonconformity beyond the limit that is of greater seriousness belongs to one class to which a single AQL applies, and the total nonconformity beyond both limits belongs to another class to which a larger AQL applies.

NOTE It follows that, where there are different producers or production processes, this British Standard will need to be applied to each one separately.

Note that, in the case of two or more quality characteristics, nonconformity on more than one quality characteristic may belong to the same class.




Standard NumberBS 6002-2:2007
TitleSampling procedures for inspection by variables. General guide to single sampling plans indexed by acceptance quality limit (AQL) for lot-by-lot inspection of independent quality characteristics
StatusSuperseded, Withdrawn
Publication Date28 February 2007
Withdrawn Date30 September 2013
Normative References(Required to achieve compliance to this standard)BS ISO 3534-2, BS 6002-1:2007, ISO 2859-2, ISO 2859-1, BS 2846-7, BS 6001-2, BS 7785, BS 7782, BS 6001-1, BS ISO 3534-1
Informative References(Provided for Information)BS 6001-0, ISO 10576-1:2003, MIL-STD-414, BS 2846-4, ISO 31-11, BS ISO 5725-2
Replaced ByBS ISO 3951-2:2013
ReplacesBS 6002-1:1993, ISO 3951:1989
Draft Superseded By05/30134584 DC
DescriptorsSampling methods, Sampling tables, Mathematical calculations, Acceptance inspection, Quality control, Control charts, Standard deviation, Quality assurance, Inspection, Power spectra, Statistical quality control, Inspection by variables, Normal distribution
ICS03.120.30
CommitteeSS/5
ISBN978 0 580 50164 7
PublisherBSI
FormatA4
DeliveryNo
Pages96
File Size1.365 MB
Price£274.00


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