Tuesday, August 25, 2015

Acquired Quality Level (AQL)

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The AQL (Acceptable Quality Level) concept was first devised in connection with the development of statistical acceptance sampling for the Ordinance department of the U.S. Army in 1942, modified as MIL-STD- 105A in 1950, MIL-STD-105B in 1958, MIL¬STD-105C in 1961, MIL-STD-105D in 1963. American, British, Canadian military agencies has accepted it as common standard of  acceptance sampling, that is why it is also called ABC, standard. Later on this standard has accepted by most of American and European organizations. Latest development of these series is MIL-STD-105E in 10 may 1989.


For the use of 'US-MIL-STD-105E we have to choose level of AQL first, next step is to find out sample size code letter according to lot size from the sample size code letter table, then: with" the help of sample size code letter and AQL level, to find out acceptance number and rejection number from the normal or tighten, single or double sampling table of US-MIL-STD-105E.

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