  In this paper, we have discussed the stochastic comparison of the smallest
and largest ordered statistic from independent heterogeneous Weibull-G random
variables and Gompertz Makeham random variables. We compare systems arising
from taking different model parameters and obtain stochastic ordering results
under the condition of multivariate chain majorization. Using the notion of
vector majorization, we compare different systems and obtain stochastic
ordering results.
