Today, businesses are required to create new value. To do this, we need to understand the essence of the whole and then define the parts. A systems engineering approach that considers the whole as a system is important in thinking about what a business should do and why, and what the system should be to realize it. In this keynote speech, I would like to discuss the use of MBSE, which is necessary to promote digital engineering, and DX, which is involved in process and organizational transformation.