(1) The system of interest to an observer
(2) The system whose life cycle is under consideration. A system of interest is a collective set of all elements of a system, or the primary system, or the enabling system.
(1) von Bertalanffy, L. 1968. General system theory: Foundations, development, applications. Revised ed. New York, NY: Braziller.
(2) ISO/IEC/IEEE. 2008. Systems and Software Engineering - System Life Cycle Processes. Geneva, Switzerland: International Organization for Standardization (ISO)/International Electronical Commission (IEC), Institute of Electrical and Electronics Engineers. ISO/IEC/IEEE 15288:2008 (E).
(1) is the system science definition and applies to all systems
(2) a Systems Engineering definition relevant to engineered systems
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