Hi Mark, Thanks for your answer. I was aware JMP can show likelihood contour charts for individual distributions. However, I was looking for a (quick and simple) method to overlay two or more such plots on a single chart, because (a) It strikes me as a natural capability of any statistical SW package designed for reliability engineering, especially one intended and designed for providing means for comparing reliability distributions. (b) I’ve found this representation method very useful and illuminating, especially when one need to communicate results to management or other engineers (generally people with less solid statistical background). (c) Most statistical SW packages, including JMP, will provide many methods of comparing the mean of distributions, however, (modern) reliability design practices, comparing the mean is not very useful since we are interested much more in the tails of distributions or in the effect of the entire distribution. Zvika
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