SOXS (SOn of X-Shooter) is a high-efficiency spectrograph with a mean Resolution-Slit product of about 3500 over the entire band capable of simultaneously observing the complete spectral range 350-2000 nm. It consists of three scientific arms (the UV-VIS Spectrograph, the NIR Spectrograph, and the Acquisition Camera) connected by the Common Path system to the NTT, and the Calibration Unit. During the last year, we performed the instrument AIV at the integration site in Europe. It is still ongoing. We present an overview of the flow for validation of the scientific and technical requirements, after integration of the sub-systems with some results as highlights. Further, we give an overview of the methodologies used for planning and managing the assembly of the sub-systems, their integration, and tests before the acceptance of the instrument in Europe (PAE). SOXS could be used as an example for the system engineering of an instrument of moderate complexity, with a large geographic spread of the team.
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