SOXS (SOn of X-Shooter) is a high-efficiency sp ectrograph wi th a me an Re solution-Slit pr oduct of ab out 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 a nd t echnical r equirements, a fter i ntegration o f t he s ub-systems w ith s ome r esults as highlights. Further, we give an overview of the methodologies used for planning and managing the assembly of Further author information: