Abstract: The V/L code simulation method has been employed to develop Pcd/h of an electric relay which was used as a target in an experimental study for achieving its Pcd/h. Three different simulations have been conducted to reproduce kill probabilities of the relay resulted from the experiment. While vulnerability simulations produced much lower kill probabilities than the experiment result, a lethality simulation correctly reproduced it. It is discussed that if the lethality simulation setup correctly re-enacted the experiment, the experiment result cannot be interpreted as correct Pcd/h of the relay. Rather the correct one should be the result of the vulnerability simulation performed with the same setup as the lethality simulation. Finally, this paper concludes with stress on the need and importance of complementary use of the simulation and experiment methods in deriving component Pcd/h.