In the December 1991 issue of this journal, Wild and Pignatiello proposed an experimental design strategy for designing robust systems using discrete-event simulation; their strategy used Taguchi's method for improving product and process quality in manufacturing. Now I propose two alternative techniques. One technique requires fewer observa tions than Taguchi's technique does. The second technique requires many more observations, but pays off since it quantifies the risk caused by uncontrollable environmental conditions.
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