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Acceptable Quality Level (AQL)

Acceptable Quality Level (AQL)

What Is Acceptable Quality Level (AQL)?

The acceptable quality level (AQL) is a measure applied to products and defined in ISO 2859-1 as the "quality level that is the most horrendously terrible passable." The AQL lets you know the number of defective parts that are viewed as acceptable during random sampling quality inspections. It is normally communicated as a percentage or ratio of the number of imperfections compared to the total quantity.

How Acceptable Quality Level (AQL) Works

Goods in a sample are tried at random, and assuming that the number of defective things is below the foreordained amount, that product is said to meet the acceptable quality level (AQL). In the event that the acceptable quality level (AQL) isn't gone after a specific sampling of goods, manufacturers will survey the different boundaries in the production cycle to decide the areas causing the deformities.

The AQL of a product can shift from one industry to another; medical products, for instance, have rigid AQLs on the grounds that defective products are a wellbeing risk.

For instance, consider an AQL of 1% on a production run. This percentage means that something like 1% of the batch can be defective. In the event that a production run is made out of 1,000 products, just 10 products can be defective. In the event that 11 products are defective, the whole batch is rejected. This figure of at least 11 defective products is known as the rejectable quality level (RQL).

The AQL is an important statistic for companies seeking a Six Sigma level of quality control, which is a quality-control methodology developed in 1986 by Motorola, Inc. AQL is otherwise called the acceptable quality limit.

Special Considerations

The AQL of a product can fluctuate from one industry to another. For instance, medical products are bound to have more rigid AQL in light of the fact that defective products can bring about wellbeing risks.

Conversely, a product with harmless secondary effects from a potential imperfection might have a less severe AQL, like the remote control for a TV. Companies need to gauge the additional cost associated with the rigid testing and possibly higher spoilage due to a lower imperfection acceptance with the expected cost of a product recall.

Customers would, of course, favor zero-deformity products or administrations; the best acceptable quality level. Nonetheless, venders and customers as a rule try to show up and set acceptable quality limits in light of factors normally connected with business, financial, and safety concerns.

AQL Defects

Cases of inability to meet customer quality requirements are named as imperfections. In practice, there are three categories of imperfections:

  1. Critical defects: Defects, when accepted could hurt users. Such imperfections are unacceptable. Critical imperfections are defined as 0% AQL.
  2. Major defects: Defects typically not acceptable toward the end-users, as they are probably going to bring about disappointment. The AQL for major deformities is 2.5%.
  3. Minor defects: Defects not liable to reduce really the ease of use of the product for its planned purpose however that contrast from indicated standards; some end users will in any case buy such products. The AQL for minor imperfections is 4%.

AQL in Practice

Acceptable quality level (AQL): AQL is commonly viewed as the most terrible quality level that is as yet thought to be agreeable. It is the maximum percent defective that can be thought of as good. The likelihood of accepting an AQL parcel ought to be high. A likelihood of 0.95 means a risk of 0.05.

Rejectable quality level (RQL): This is viewed as an unsuitable quality level and is once in a while known as part tolerance percent defective (LTPD). The buyer's risk has been standardized in certain tables as 0.1. The likelihood of accepting a RQL part is low.

Aloofness quality level (IQL): This quality level is somewhere close to AQL and RQL. Various companies keep up with various understandings of each deformity type. Nonetheless, buyers and venders settle on an AQL standard that is fitting to the level of risk each party expects. These standards are utilized as a reference during a pre-shipment inspection.


  • The AQL varies from one product to another. Products that could cause to a greater extent a wellbeing risk will have a lower AQL.
  • Batches of products that don't meet the AQL, regularly founded on a percentage measurement, are dismissed when tried during pre-shipment inspections.
  • The acceptable quality level (AQL) is the most terrible quality level that is okay for a product.