The application of cumulative sum charts to the acceptance of product, as distinct from process control, is described and compared with existing acceptance sampling plans for dealing with continuous production. These new plans are evaluated in terms of their OC curves and, where appropriate, their Average Outgoing Quality Limits. The extension of this procedure to acceptance sampling by variables is also described.
In this article previously published acceptance sampling plans for continuous production are summarised and certain shortcomings pointed out. A new procedure is put forward in the Variable Lot‐Size Acceptance Sampling Plan, which combines the useful features of lot‐by‐lot plans with the flexibility of continuous plans. The advantages and general features of this plan are described, and a table is given which enables AOQL values to be calculated.
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