Prepared with this knowledge, ATV trainees start off with classroom lessons, which give them a general overview of what the ATV is, how it works and what happens during an ATV mission. This is followed by a first tour through the ATV mock-up. Here the astronauts can put into practice what they learned in class – an approach that returns throughout the training.
Before the astronauts can proceed to the 'real action' – such as how to dock ATV to the ISS, and how to supervise cargo transfer to the ISS – there is more classroom work to be done. The trainees attend lessons on the ATV's systems and its navigation sensors. These conclude the 'core lessons' – the basics about the ATV spacecraft and how it works.