Acceptance sampling is a statistical method that enables us to base the accept reject decision on the inspection of a sample of items from the lot. The items of interest can be incoming shipments of raw materials or purchased parts as well as finished goods from final assembly. Typical application of acceptance sampling is for lot disposition, sometimes referred to as lot sentencing, for receiving inspection activities. Accepted lots are put into production. Rejected lots may be returned to supplier or subjected to other lot-disposition action. Sampling methods may also be used during various stages of production.
“Acceptance sampling is concerned with the decision to accept a mass of non-conforming to quality.The decision is reached through sampling”.
By Simpson and Kafka
Acceptance sampling is employed when one or several of the following hold:
- Testing is destructive
- The cost of 100% inspection is very high
- 100% inspection takes too long
Procedure for Acceptance Sampling
Acceptance sampling is a form of quality testing used for incoming materials or finished goods. e.g., purchased material & components. The procedure of acceptance sampling consists of the following steps.
- Take one or more samples at random from a lot (shipment) of items.
- Inspect each of the items in the sample.
- Decide whether to reject the whole lot based on the inspection results.