Lot Tolerance Percent Defective
Meaning ~ Lot tolerance percent defective establishes the maximum percentage of defects allowed in an isolated batch for it to be accepted at a low consumer risk level.
Consumer Risk Percentage
Meaning
Statistical probability limits determine the chance that a sampling plan accepts a lot of unacceptable quality. This threshold, representing the consumer risk percentage, measures the exposure of a buyer to receiving substandard shipments. It applies only to the selected sampling plan and does not guarantee the quality of unsampled batches.
Statistical Boundary
Mathematical calculations determine the operating characteristic curve to model how a sample performs under varying defect levels. In this analysis, the consumer risk percentage corresponds to the probability of acceptance at the rejectable quality level. Suppliers try to keep this number low to protect the brand reputation of the buyer.
Contractual Setting
Buying agreements specify the acceptable and rejectable quality levels to define the boundary of acceptable performance. The agreed consumer risk percentage determines how many samples the quality inspector must test. Lower numbers require larger sample sizes, which increases the cost of the quality control process, adds hours to the processing times of the warehouse, and demands specialized laboratory equipment.
Financial Exposure
Failing to align these limits can lead to high rates of field failures and warranty claims. If the consumer risk percentage is set too high, the buyer receives more defective material than the commercial model can support. Disputes over these rates are resolved by independent laboratory testing of the stored master samples.