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IT service continuity management (ITSCM) is very important to current organizations. It ensures that the organizations can reduce and limit tangible and intangible losses of business in the events of contingencies or disasters. However, current risk management approaches and methodologies cannot focus on ITSCM. Therefore, this paper presents a risk assessment method to evaluate the risk exposure of one service. Further, we show how to use the risk exposure metric to select the optimal proactive measures. The optimal measure set is achieved through a set of experimental results.