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The goal of this research is to improve SLA Index that measures service performance level as a result of outsourcing Information system, and also to identify the best application method. This research identifies SLA applied cases and improving points based on the evidence collected from three major financial institutions that utilized outsourcing. First this study analyzes SLA applied cases of two different companies and discusses SLA application improvement possibilities. It then introduces a successful case of a third company that adopted SLA index.