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Executive summary

Requirements for an accept-zero sampling system based on the credit principle for controlling outgoing quality.


This British Standard, a part of the BS 6001 series, specifies a system of single sampling schemes for lot-by-lot inspection by attributes. The sampling plans of the present system are of accept-zero form, i.e. no lot is accepted if the sample from it contains one or more nonconforming items. The schemes depend on a suitably defined average outgoing quality limit (AOQL), the value of which is chosen by the user; no restrictions are placed on the choice of the value of the AOQL or on the sizes of successive lots in the series. The methodology ensures that the overall average quality reaching the customer or market-place will not exceed the AOQL in the long run.

This British Standard is suitable for regulatory purposes, as control of the expected quality of items reaching the market-place is achieved with the smallest possible sample sizes, and long-term control of the realized, or actual quality level in the market-place is achieved with certainty, regardless of how long or short individual suppliers' series may be. This standard can be used by suppliers/producers, buyers/consumers and regulatory agencies to provide control of the expected quality of the totality of accepted product of each type from each source.

History and related standards

This British Standard supersedes BS 6001-7:2001 which is withdrawn.

This standard includes the cross reference: ISO 3534-2.

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