Abstract
The NTT DATA Financial Core Co., Ltd. develops the basic information system of financial institution and is maintaining it. The development of the basic information system of the financial institution is often a large-scale project that uses a large-scale mainframe. Therefore, it might take several years to reform according to the end of the life cycle of the system. In the reform of the basic information system of the financial institution, the business continuance is a key problem. However, the system configuration and the operation work are very complicated, and it is difficult to specify the range of potential of the risk to the business continuance. Therefore, measures in a new system and the entire old system are necessary. Even if a new system is beginning, an old system cannot be abandoned. In this text, it thinks about the problem concerning an old system in the system reform.
