Codes & Standards - Purchase
a) production is intermittent (not continuous);
b) production is from several different sources in varying quantities, i.e. job lots;
c) lots are isolated;
d) lots are resubmitted after inspection.
The sampling plans in this document are indexed by a series of specified values of limiting quality (LQ), where the consumer's risk (the probability of acceptance at the LQ) is usually below 0,10 (10 %), except in some instances.
This document is intended both for inspection for nonconforming items and for inspection for nonconformities per 100 items.
It is intended to be used when the supplier and the consumer both regard the lot to be in isolation. That is, the lot is unique in that it is the only one of its type produced. It can also be used when there is a series of lots too short for switching rules to be applied.