Because of the merger of companies, both of two information systems must be combine into one system. Many risks arise during the integration process, and the risks may bring out the system failure. Mizuho Bank established by the merger of 3 banks produced serious system failure two times. I have concluded that the system failure is relevant to the risks by the merger. Also I have mentioned the integration process of North Pacific Bank and the Bank of Tokyo-Mitsubishi UFJ.
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