acceptable quality limit
英[əkˈseptəbl ˈkwɔliti ˈlimit]美[ækˈsɛptəbəl ˈkwɑlɪti ˈlɪmɪt]
The acceptable quality limit (AQL) is the worst tolerable process average (mean) in percentage or ratio that is still considered acceptable; that is, it is at an acceptable quality level.Dodge, Y.