Abstract
AN increasing number of British Standards refer to quality control in acceptance clauses, and B.S. 1313 : 1947 has been prepared to meet the need for a publication which would describe the simplest method of quality control, by the examination of the fraction defective in samples. It sets out accepted methods which are easy to use and which may safely and profitably replace 100 per cent routine examinations. They are widely applicable, and the publication, without dealing with the statistical principles underlying the methods, attempts to show how to use them. Simple instructions are given for the construction and use of a quality control chart in the first section. The second section deals with the methods in more detail, describing the basis of fraction-defective charts, with detailed recommendations for sample size and interval, and normal control limits. Refinements in the general method are indicated in the third section, such as the uses of average level of defectives, two-way control charts and compressed-limit control charts. The necessary-tables with instruction sheets containing fully worked out examples are given in a further section, and a bibliography is appended.
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A Standard for Quality Control. Nature 161, 50–51 (1948). https://doi.org/10.1038/161050c0
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DOI: https://doi.org/10.1038/161050c0