The vast majority of inspectors follow the ISO standard. It should be reserved for business with regular suppliers. The standard explains it this way:. ISO was developed primarily for the inspection of a continuing series of lots all originating from the same production or servicing process.
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The vast majority of inspectors follow the ISO standard. It should be reserved for business with regular suppliers. The standard explains it this way:. ISO was developed primarily for the inspection of a continuing series of lots all originating from the same production or servicing process. For one-shot orders, or for new suppliers, part 2 is to be used. ISO provides sampling plans applicable for use when individual or isolated lots are to be sampled. These sampling plans are in many instances identical to those in ISO Is it a big problem if part 1 based on the AQL tables is used in circumstances where part 2 is actually applicable?
Not really. Sampling plans in ISO may also be used for the inspection of lots in isolation, but in this case, the user is strongly advised to consult the operating characteristic curves to find a plan that will yield the desired protection.
When to use part 3, and check only random batches rather than all batches? For very good suppliers only:. ISO provides skip-lot procedures for use when the process quality is markedly superior to the AQL for a defined long period of delivery or observation. ISO provides a procedure that may be used to verify a quality level that has been declared for some entity. The procedures in ISO have been developed in response to the need for sampling procedures suitable for formal, systematic inspections such as reviews or audits.
ISO provides a method of establishing sequential sampling plans of discriminatory power essentially equivalent to that of corresponding plans of ISO In conclusion, QC practitioners tend to make their job easy and simplify the rules to follow. I think it is, to a large extent, not a problem. Improving your quality assurance will help avoid poor quality products from hurting your business.
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ISO Sampling procedures for inspection by attributes - Part 3: Skip-lot sampling procedures. The skip-lot sampling procedures specified in ISO are applicable to, but not limited to, inspection of end items, such as complete products or sub-assemblies, components and raw materials, and materials in process. Related Products Standard ISO Sampling procedures for inspection by attributes - Part 5: System of sequential sampling plans indexed by acceptance quality limit AQL for lot-by-lot inspection ISO contains sequential sampling schemes that supplement the ISO acceptance sampling system for inspection by attributes, whereby a supplier, through the economic and psychological pressure of lot non-acceptance, can maintain a pro ISO establishes sampling plans and procedures by variables that can be used to assess whether the quality level of an entity lot, process, etc.
ISO 2859-3 Skip-lot Sampling 5.1.1, 5.2.1
ISO specifies generic skip-lot sampling procedures for acceptance inspection by attributes. The purpose of these procedures is to provide a way of reducing the inspection effort on products of high quality submitted by a supplier who has a satisfactory quality assurance system and effective quality controls. The reduction in inspection effort is achieved by determining at random, with a specified probability, whether a lot presented for inspection will be accepted without inspection. This procedure extends the principle of the random selection of sample items already applied in ISO to the random selection of lots. The skip-lot sampling procedures specified in ISO are applicable to, but not limited to, inspection of end items, such as complete products or sub-assemblies, components and raw materials, and materials in process. Check out our FAQs.
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