‘AQL’. stands for ‘Acceptance Quality Limit’, and is defined as the “quality level that is the worst tolerable” (ISO 2859-1 standard).
Acceptable Quality Limit (AQL) is the standard used by many Quality Control Inspection firms and inspectors to determine a proper sampling size and the number of allowable defects. AQL is a statistical measurement of the maximum number of defective goods considered acceptable in a particular sample size.
History of AQL
Prior to the mid-1900s, acceptance sampling was not widely followed. Acceptance sampling was popularized by Dodge and Roming (pioneers of modern Quality Control) and was originally applied by the U.S. military for testing bullets during World War II. The dilemma was, if every bullet was tested in advance, no bullets would be able to ship on time. If, on the other hand, no bullets were tested, malfunctions might occur on the battlefield, with potentially catastrophic results.
The AQL tables will help to determine the sampling size according to your ordered quantity and specified level of severity. You can choose Levels I, II or III, with Level III being the most stringent testing and Level I being the least. The standard level, most commonly in the apparel industry is the Level II. Though this is up to the client, but it is the most recommended level.
Kaizen (改善?), Japanese for "improvement", or "change for the better", 改 ("kai") which means "change" or "to correct" and 善 ("zen") which means "good", refers to philosophy or practices that focus upon continuous improvement of processes in manufacturing, engineering, and business management