the conditional stress-strength parameter for multi-component systems

A parameter for multi-component stress-strength systems has been introduced.the introduced parameter may be of wide applications in general s of k systems.the new parameter which is conditional stress-strength with respect to the past informationof the system and its maximum likelihood estimator has been calculatedwhen the strength and stresses random variables are exponentially distributed. somenumerical and graphical studies on the ml estimators have been done to verify theanalytic results.