Critical to ESO’s DSM development (and therefore also to MUSE) is ASSIST: Adaptive Secondary Setup and Instrument STimulator. This facility will act as the primary test-bench for ESO’s DSM development, used for verifying control algorithms and hardware, functional validation of AO-Facility instruments, and ensuring the DSM operates at specification before being deployed at the VLT. ASSIST wasdeveloped and assembled in Leiden and deliverd to ESO in mid 2011. Preliminary Acceptance took place in October 2012, in time for the delivery of the DSM.