Architecting of Systems for

Systems architecting, requirements engineering and model-based systems engineering are the dominant schools of thought in systems engineering today. They evolved in response to each other, partly in agreement and partly in opposition. To some extent they invented their own terminology and semantics. Due to overlaps, systems engineering as a whole lost some coherence of terminology and semantics. This paper proposes a fusion of systems architecting, requirements engineering and model-based systems engineering. Three fundamental principles are taken for guidance: making the best use of human cognitive capabilities, applying value stream thinking, and considering the whole system life cycle. On the basis of previous work, two essential solution elements are described: the strict interpretation of the V as the overall systems engineering value stream, and appropriate system life cycle phase models. In the overall systems engineering value stream the commonality of the engineering of systems-of-systems with the engineering of any other system or system element in the system architecture becomes visible. However, the integration of architectural frameworks and value stream thinking bears still major challenges. The system life cycle considerations emphasise the integration of systems engineering in an enterprise in support of portfolio strategy development and business planning.