Sampling plans and procedures must be statistically valid and should be based on scientifically sound
sampling practices taking into account the risk associated with the acceptance of the defective product based
on predetermined classification of defects, criticality of the material, and past quality history of the vendor.
In some circumstances, such as for large number of containers, a sampling plan based on (/n+1) may be
acceptable. However, a sampling plan based on (/n+1) may present a significant risk of accepting defective
goods in certain circumstances, such as the sampling of a small number of containers. As with all sampling
plans, documented justification must be available.
