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Acceptable Quality Level (AQL)

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  • #28397

    wei
    Member

    AQL is defined as the largest percentage of defectives that can make the lot definitely acceptable. I wonder why some of then sampling table have AQL > 100%. What does it indicates? Thanks!

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    #70645

    Dave Strouse
    Participant

    AQL is the the maximum percent nonconforming(or the maximum number of nonconformities per hundred units) that, for purposes of sampling inspection, can be considered satisfactory as a process average.    ANSI/ASQC Standard Z1.4-1993 paragraph 4.1
    This standard also says to interpret AQL in it’s tables as percent nonconformity or nonconformities per 100 units inspected under 10.0 and as nonconformities per 100 units inspected only above 10.0. para 4.5

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    #70715

    Jugal Prasad
    Participant

    Just a suggestion. Whenever you are sampling never develop sampling plan based on AQL only. I find Larsen Nomograph quite useful for developing sampling plan where you have AQL and RQL and the risk you are willing to take for those quality level.
     
    Jugal

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    #70722

    Gabriel
    Participant

    Jugal;
    1.- Whas does RQL means ?
    2.- Whre I can find the Larsen nomograph ?
    Thanks.

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