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Identifying, prioritizing and considering risks represent common management activities. For a long time, hazard risks, as well as financial ones have been actively managed. But, the variety, number and interactions between risks are continually increasing. Nowadays assessing risks is used in many fields such as technology (Li and Zhang, 2011), decision making (Zhang et al., 2011) and engineering (Bao et al., 2011, Hsu and Wang, 2011). On the other hans fuzzy logic is one of the most useful methods that has been used in different areas such as engineering (Xu and Zhao, 2012, Zhang et al., 2012, Zhang ET AL., 2011, Sung et al., 2011, Zhai et al., 2011), decision making (Zhiqiang, et al., 2012, Kilincci et al., 2011, Chamodrakas et al., 2011, Xianzhang et al., 2012) and medicine (Gadaras and Mikhailov, 2011, Lekkas and Mikhailov, 2010, Uzoka et al, 2011). The operational and strategic risks have increased due to the failure of the control mechanisms in a very dynamic business environment. In these circumstances, the organizations admit the importance of managing all risks, including the standard and the new risks. (Bodea and Dascalu, 2009).
In risk management, often, managing and reacting to all identified risks is not possible, so prioritizing risks based on their importance seems inevitable. Therefore, risk assessment process is used for this purpose. (Salehi Sedghiani, 2009).
After risks identification, next step is to evaluate likelihood and effect of them to risk management activities. This makes risks managed due to their priorities. This process relates identification of systematic risks with logical management based on importance of risks. (Raz & Michael, 2001).