Meaning
Standard sampling intensity designated in ISO 2859-1 establishing normal discrimination power for lot acceptance without incurring excessive testing expenses. Specifying inspection level II balances sample size against statistical discrimination capacity, making it the default baseline across international commercial trade contracts. The sampling plan defines exact sample sizes based on total batch quantity and agreed acceptance quality limits.
Sampling Model
Sample sizes scale non-linearly with total lot size, optimizing inspection efficiency for large manufacturing runs. Under inspection level II, a lot of 10,000 units requires a sample size of 200 units for normal single sampling. Default parameters provide sufficient statistical protection without overburdening factory quality control laboratories.
Commercial Application
Importers use standard level II inspections for routine product validation when vendor quality history remains consistent and satisfactory. Contractually mandating inspection level II gives both buyer and seller a recognized baseline for lot approval or rejection decisions. Switching to tightened level III or reduced level I occurs only when vendor quality performance changes significantly over consecutive shipments.
Operational Limit
Normal sampling plans provide general quality assurance but remain unsuited for high-risk component verification or destructive testing scenarios. Employing inspection level II for critical safety components provides insufficient statistical coverage, necessitating specialized S-1 or S-2 destructive sampling plans instead.
