When a lot is considered in isolation, a quality level which for the purposes of sampling inspection is limited to a low probability of acceptance. Notes: (1) For a particular sampling system, the probability of acceptance will lie within a defined range. (2) Limiting quality is an unsatisfactory term but it is widely used. Isolated lot limiting quality level is a more satisfactory name for the concept. [2: 2.7.3].

When a continuing series of lots is considered, a quality level which for the purposes of sampling inspection is the limit of an unsatisfactory process average. [2: 2.7.2].

Inspection of product submitted in a series of lots. [2: 1.2.4].