A system-of-interest is
|“||[t]he system that is the focus of the systems engineering effort. The system-of-interest contains system elements, system element interconnections, and the environment in which they are placed.||”|
"The system-of-interest is an element of the system. The boundary of the system-of-interest is typically determined relative to the authorization boundary. However, it can be determined by other boundaries established by programmatic, operational, or jurisdictional control. The target system is also referred to as the system of interest."