如何定义critical defect, major defect, minor defect

Critical – Any condition found which poses the possibility of causing injury or harm to, or otherwise endangering the life or safety of, the end-user of the product or others in the immediate vicinity of its use.

An example of a critical defect might be a sharp plastic bur that has the potential to scratch or otherwise harm people.  The AQL (acceptable quality level) is generally 0.10 here so any critical defects noted would result in a rejected inspection.

Major – Any condition found adversely affecting the product’s marketability and sale-ability or adversely affecting its required form, fit or function and which is likely to result in the end-user returning it to the source from which is was purchased for replacement or refund.

An example of a major defect might be a large (1.5″ or larger) scratch on the exterior front of the product.  The AQL is generally tighter for major defects noted, so less is acceptable in a general sample size to achieve a passing result.

Minor – Any condition found which while possibly less than desirable to the end-user of the product, does not adversely affect its required marketability, sale-ability, form, fit or function and is unlikely to result in its return to the source from which it was purchased.

An example of a minor defect might be a small (up to 1.5″) scratch on the bottom of the product.