Sampling plan.
Sampling plan. A specific plan which states the sample size, acceptance number(s) and rejection number(s). In the standards of this subpart two types of sampling plans are provided:
(a) Single sampling plan. A sampling inspection scheme in which a decision to accept or reject an inspection lot is based on the inspection of a single sample. A single sampling plan consists of a single sample size with associated acceptance and rejection number(s).
(b) Double sampling plan. A sampling inspection scheme which involves use of two independently drawn but related samples, a first sample (n1) and a second sample which is added to the first to form a total sample size (nt). A double sampling plan consists of a first and total sample size with associated acceptance and rejection number(s). Inspection of the first sample leads to a decision to accept, to reject, or to take a second sample and the examination of a second sample, when required, always leads to a decision to accept or reject.