ISO 2859-1
Meaning ~ Governs sampling schemes for lot-by-lot inspection by attributes to manage supplier quality levels through statistically derived acceptance limits.
AQL Index
Meaning
Quality benchmark tables in standard international sampling systems designate acceptable defect percentages across production batches. Purchasing agreements reference an aql index to establish the maximum tolerable proportion of nonconforming items during incoming batch inspections. Factory output that maintains defect rates below this specified point passes statistical verification without full sorting.
Statistical protection applies exclusively to lot-by-lot acceptance sampling under process control and ceases to govern once a shipment undergoes complete manual sorting.
Threshold Allocation
Quality specifications record these numerical figures inside master service agreements and purchase order schedules. Parties specify different values for critical and major nonconformities within the same table. Selecting a standard aql index shifts the operational burden between supplier rework capacity and buyer receipt tolerance.
Operational Trigger
Sampling tables map the batch volume against the chosen standard level to determine specific pass and fail counts. Exceeding the allowed defect count during pre-shipment inspection halts release authorization immediately. Freight remains locked at the port of origin until corrective disposition clears the inventory.
Financial Exposure
Mishandling these statistical boundaries creates unexpected costs during lot acceptance disputes. Accepting batches with unadjusted risk thresholds transfers sorting expenses directly to destination warehouses. Importers incur secondary inspection charges and delayed market entry fees when re-testing becomes necessary.