Meaning
Statistical procedures for inspection by attributes define the quantity of parts pulled from a production lot to determine the fate of the entire batch. Using acceptance sampling plans iso 2859 1 allows a quality manager to decide whether to accept or reject a shipment based on the number of defects found in a representative subset. The standard provides tables for different inspection levels that balance the cost of testing against the risk of passing poor quality material.
Statistical Basis
Probabilistic models provide the foundation for selecting sample sizes that represent the whole population. These acceptance sampling plans iso 2859 1 rely on the acceptable quality limit to set the maximum percentage of nonconforming items that can be considered satisfactory as a process average. Higher inspection levels increase the sample size to provide greater protection for the buyer, which requires more labor or time.
Lot Assessment
Disposition of a production run depends on the results of the attribute check. If the count of nonconforming units is below the rejection number, the entire lot passes.
Consumer Risk
Protection against accepting a batch with excessive defects remains the primary function of these rules. While no sampling method guarantees zero defects, acceptance sampling plans iso 2859 1 minimize the chance of a bad lot entering the supply chain. This statistical control prevents the high costs associated with secondary assembly failures or field returns.
