Systems Engineering requires the involvement of different engineering disciplines: Software, Electronics, Mechanics, Optics etc. Systems Engineering of Astronomical Instrumentation is no exception to this. A critical point is the handling of the different point of view of these disciplines often related to different tools and cultures. We developed an hybrid Model Based Systems Engineering (MBSE) approach to help the Sys. Eng. to keep control without imposing to the participants procedures and methods that may be seen as a bureaucratization. In the first phase, starting from the top-level requirements we deployed all the flow down to subsystem, including requirement generated by different use cases (calibration, AIV, …) and interfaces. This approach allowed us to have under control not only the requirement tracing, but also all the instrument operations “from cradle to grave”. In a next stage we will include also artifacts coming from the different engineering world (CAD, FEM, ...).
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