Sampling inspection is a method based on the evidence of a small sample to decide if a batch of components, materials, or products, are to be accepted or rejected. Once the decision to accept a ‘good’ batch is made, the accepted product passes on to the next stage of manufacture, or goes for sale and use. If the decision is to reject a ‘bad’ batch, a further decision is necessary. For example, whether to return, scrap, or rework the components. The decision to scrap or rework is complicated and is discussed further in Chapter 15, but in this chapter the theory and practice of sample inspection is described. In Chapter 3 it was shown that by taking a small sample from a large population, a representative or unrepresentative sample may be yielded. It is therefore necessary, when sampling, to produce a scheme which minimizes the risk of errors occurring.
KeywordsSampling Plan Batch Size British Standard Institution Double Sampling Average Sample Size
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