I am an astrophysicist and the ELT Programme Scientist. The ELT is set up as a program of the European Southern Observatory (ESO). It includes many individual projects to build the ELT on Cerro Armazones, a mountain more than 3,000 meters high in Chile. Thus, there is one project to build the mirrors, one for the instruments, one for the infrastructure, one for the dome, etc. The level at the top of the program has to coordinate all the activities and make sure that the complete system works like an observatory afterwards. I am responsible for making sure that we fulfill our promise to the world's scientific community and enable them to conduct research and make further discoveries. To do that, we have a great team of engineers. They design the telescope and the instruments, plan the construction phases, and are in contact with the manufacturing industries of the components and the telescope materials. And then Hapag-Lloyd comes into play and ships everything from Europe to Chile. There, all the parts are assembled and put into operation. The programme has to check everything and make sure that the ELT works correctly and reliably.