The Limiting Quality Level (LQL) is used in sampling inspection. It is the proportion of nonconforming items associated with the consumer’s risk. It can be regarded as the minimum quality that the customer would not want to accept, even for a single batch. The AQL is the minimum acceptable long term average. See also OC Curve.
The Lot Tolerance Percent Defective is an alternative term for the LQL. The LTPD is expressed as a percentage, the LQL is usually expressed as a proportion.