These rules for terminating testing involve achieving specified levels of credibility in both: (1) the probability of the posterior estimate of the exponential scale-parameter, /spl theta/, after some, m, of the units have been tested, and (2) the mean of the probability of /spl theta/ over the remaining units, when viewed pessimistically. Sample decision tables and a numerical example illustrate both the sequential and batch testing cases. Large savings in test times can be achieved whenever the first m units present strong evidence in favor of either hypothesis (H/sub 0/: /spl theta/=/spl thetasub 0/ vs. H/sub 1/: /spl theta/=/spl thetasub 1/, /spl thetasub 1/>/spl thetasub 0/).
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