The instrument being designed, reviewed and accepted by ESO board members, the procurement of mechanical and optical parts can start. Some parts can be found on the shelves, some cannot and must be manufactured especially for ESO. In that case, it is important to follow up the manufacturing of these pieces. For instance the instrument housings are very particular parts with tight specifications and special requirements.
Some interactions between ESO, "the customer", and the manufacturer are unavoidable. Our department often plays an important role at this stage in order to ensure the quality of individual parts and subsystems.
Assembly, Integration and Testing