Q: What’s the criteria of the inspection?
A: The criteria of the inspection determines what the sampling plan to be used, what AQL (Acceptable Quality Levels) to be chosen, and the classification of the defective etc.
Q: What’s Method of acceptance sampling?
A: Acceptance sampling is “the middle of the road” approach between no inspection and 100% inspection.The samples should be picked at random from the lot, and on the basis of information that was yielded by the samples, a decision should be made regarding the disposition of the lot. In general, the decision is either to accept or reject the lot. This proven method is widely used statistical procedure in quality control services.
Q:How do I determine Sampling standard?
A: The ISO 2859/ANSI/ASQC Z1.4 /BS 6001/DIN 40080/NF X 06-022 tables is used for sampling. This standard is a proven method to accept or reject a production lot by inspecting a randomly selected number of products.
Q:How to choose Acceptable Quality Levels?
A: the Acceptable Quality Level (AQL) used to establish a maximum allowable error rate or variation from the standard. the ISO 2859 tables (also known as AQL tables) is to measure acceptable levels of quality. These tables are a US standard with equivalents in many national and international standardization organizations (ANSI/ASQC Z1.4, ISO 2859, NFX06-022, BS 6001, DIN 40080).
Q:How do I determine the right sample size and acceptance number?
A:For a hypothetical inspection of a 5,000-unit lot, with an Acceptable Quality Level of II, Table B indicates that the sampling size should be 200 units. For an AQL of 2.5, the corresponding acceptance number is 10. If the number of defective units is higher than 10, the lot has to be rejected
Q:What’s the Defect Classification
A:Critical – A critical defect is on that judgment and experience indicate is likely to:
a. result in hazardous or unsafe conditions for individuals using, maintaining, or depending upon the products; or
b. prevent performance of the tactical function of a major end item.
A critical defective is a unit of product that contains one or more critical defects.
Major – A major defect is one, other than critical, that is likely to result in failure, or to reduce materially the usability of the unit of product for its intended purpose.
A major defective is a unit of product that contains one or more major defects.
Minor – A minor defect is one that is not likely to reduce materially the usability of the unit of product for its intended purpose, or is a departure from established standards having little bearing on the effective use or operation of the unit of product.
A Minor defective is a unit of product that contains one or more defects