DESIGNING SINGLE SAMPLING PLANS BY ATTRIBUTES FOR MANUFACTURING INDUSTRY
Keywords:
Attribute Sampling Plans, Rectifying Inspection, Average Outgoing Quality, Lot Tolerance Percent Defective, Worst Acceptable Lot Tolerance.Abstract
Manufacturers have to inspect goods manufactured by their own processes to ensure the
average outgoing quality at a maintained desired level. Currently industries use three
standards to design inspection plans - ASQC Z1.4 plans, Dodge-Roming AOQL and LTPD
plans. This paper presents a more advisable method for designing single sampling plans
for manufacturers. The idea of minimizing average total inspection is refuted and the
inadvisability of using lot tolerance percent defective, LTPD, for manufactured goods is
argued. A new measure called worst acceptable lot tolerance, WALT, is proposed to be
used in place ofLTPD in the manufacturing environment. A step-wise procedure is given
for designing plans that makes use ofsimple equations developed for this purpose.
References
Montgomery, D. c., (1991), "Statistical Quality Control". John Wiley & Sons.
Hall, 1. E. and Hassan, M. Z., (1981), "On the Cumulative Distribution of Outgoing Quality: A New Criterion for Sampling Plans ". Technometrics 23, pp. 395-400.
Guenther, W. c., (1984), "Determination of Rectifying Inspection Plans for Single Sampling by Attributes ". Journal of Quality Technology, Vol.16, pp. 56-63.
Ferrell, Jr.,W. G. and Chhoker, A., (2002), "Design of Economically Optimal Acceptance Sampling Plans with Inspection Error". Computers & Operations Research 29, pp. 1283-1300.
Markowski, E. P. and Markowski, C. A., (2002), "Improved Attribute Acceptance Sampling Plans in the Presence of Misclassification Errors ". Europ.1. Operational Research. Vo1.139, pp. 501-510.
Jaraiedi, M. and Segall, R. S., (1990), "Mathematical Modelling of DodgeRoming Sampling Plans for Random Incoming Quality". Applied Mathematical Modelling 14, pp. 264-270.
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