“…Systems often operate in cycles, and the experimenter observes the number of cycles successfully completed prior to failure. Until now, several discrete bivariate models have been proposed in the literature (see, for instance, Basu and Dhar, Campbell, Dhar, Holgate, Kocherlakota, Lee and Cha, Mishra, Nekoukhou et al ., Nikulin et al ., and Ong and Ng). An excellent survey of various discrete bivariate distributions can be found in Kocherlakota and Kocherlakota and Johnson et al .…”