In the Six Questions Framework Systems Engineering enters as the fifth question: How?
To use engineering without the context provided by answers to When, Where, Why, and Who will cause significant harm to communities and to the global ecosystem.
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Systems engineering is an interdisciplinary field of engineering and engineering management that focuses on how to design, integrate, and manage complex systems over their life cycles. At its core, systems engineering utilizes systems thinking principles to organize this body of knowledge. The individual outcome of such efforts, an engineered system, can be defined as a combination of components that work in synergy to collectively perform a useful function.
See MBSE, Model Based Systems Engineering, which was a major advancement in the engineering of complicated systems.
Beyond MBSE there is a next major innovation, PBSE, Pattern Based Systems Engineering by William Schindell. This method supports the abstraction of invariant aspects of families of models, in effect providing useful recipes which support particular models to be fully specified and then produced, starting at more general yet well understood patterns.
https://en.m.wikipedia.org/wiki/Systems_engineering
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