Acceptable Quality Limit (AQL) is a quality control procedure used both for manufacturing and receiving goods, to ensure they meet the agreed upon quality standards. AQL uses a randomized sampling process, to statistically estimate the number of defective units in a production run. Learn how to perform an AQL quality inspection using our step-by-step guide.

The default AQL level set in Lumi is Special Inspection Level 4. This level is designed to pull an adequate number of samples to represent the overall quality of the production run while staying on schedule.

Each defective unit within a sampled batch is flagged as minor, major, or critical. Once the total number of each designation has been counted, the sampled batch and larger production run is given a pass or fail. Per AQL 2.5 Inspection Level S4, these are the maximum defects permitted in a sample batch before the batch (and in turn, the larger production) goes from pass to fail.