Units, increments or samples taken one at a time or in successive predetermined groups,
until the cumulative result of their measurements (typically applied to attributes),
as assessed against predetermined limits, permits a decision to accept or reject the
population or to continue sampling. The number of observations required is not determined
in advance, but the decision to terminate the operation depends, at each stage, on
the results of the previous observations. The plan may have a practical, automatic
after a certain number of units have been examined.
PAC, 1990, 62, 1193
(Nomenclature for sampling in analytical chemistry (Recommendations 1990))
on page 1203
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by
A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997).
XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic,
J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. https://doi.org/10.1351/goldbook