Model-based systems engineering, according to the International Council on Systems Engineering, is the formalized application of modeling to support system requirements, design, analysis, verification and validation activities beginning in the conceptual design phase and continuing throughout development and later life cycle phases.

Systems Engineering and Technical Advisory contractors are government contractors who are contracted to assist the United States Department of Defense (DoD) components, and acquisition programs.

The (INCOSE; pronounced ) a not-for-profit membership organization and professional society in the field of systems engineering with about 25,000 members and associates including individual, corporate, and student members.

(SoSE) a set of developing processes, tools, and methods for designing, re-designing and deploying solutions to system-of-systems challenges.