ISO 2859-1

Acceptable Limit

Agreement on the maximum number of defects allowed in a sample is reached by setting an acceptable quality limit. This value represents the worst case percentage of nonconforming items that is considered satisfactory for the process average. The test results from the selected items then dictate the fate of the entire shipment.

Inspection Level

Adjustments to the intensity of the sampling can be made based on the history of the supplier and the criticality of the product. Normal inspection is the standard starting point but the system allows for a switch to tightened or reduced levels as the evidence of quality accumulates. Using the iso 2859-1 protocol ensures that the cost of testing remains balanced against the risk of accepting a faulty batch.

This objective approach reduces disputes between the paper mill and the converting plant by providing a clear mathematical rule for quality decisions.