Abstract
In a system development including system architecture and application program with about 150k lines of code, we were required to complete the system development within only 5 months, and deliver a high-quality system which enables stable operation. By taking various approaches, we completed the project on time. In this paper, I want to review some of the approaches, and clarify improvements and points to consider. I hope to make the use of this case study in similar system development to ensure quality, cost and delivery of system.