IMPROVEMENT ON IEC TC-56（CO）162

Bain ＆ Engelhardt’s paper² is the main foundation of IECTC-56（CO）162¹. In this paper, Some improvements for 1, 2 are presented.
Based on Lawless’ conditional method, the mumerical comparison for the approximate lower limits of weibull reliability, reliable life and characteristic life which are obtained by this paper and 1 respectively are conducted.
The results indicate that the method given by this paper is superior to the method of 1. Otherwise, we consider that the accuracies of the approximate limits from 1 for the shape parameter in both complete and censored cases and for the characteristic life in complete are very high, and can meet the practical need.