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Acceptance sampling procedures by attributes - Specified quality levels in nonconforming items per million
ISO 28597:2017 specifies, for quality levels expressed as nonconforming items per million items, procedures for estimating the quality level of a single entity (e.g. a lot) and, when the production process is in statistical control, for estimating the process quality level based on evidence from several samples.
Procedures are also specified for using this information when selecting a suitable sampling plan so as to verify that the quality level of a given lot does not exceed a stated limiting quality level (LQL).
For the case where no prior sample data is available, guidance is given for presuming a process quality level in selecting a plan.
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