The training centres are located at Houston, in the United States (NASA), Star City near Moscow (Russia), Tsukuba near Tokyo (Japan), Montreal (Canada) and at the European Astronaut Centre (EAC) in Cologne, Germany.
Each of the partners is in charge of providing training to all ISS astronauts on the elements which they contribute to the ISS Programme. For example, training at EAC focuses on the Columbus system and ESA experiment training.
Whereas basic training is often knowledge-based classroom training, pre-assignment training is mainly 'hands-on' using flight-like training mock-ups and simulators. Pre-assignment training is also generic, which means that the astronauts learn about systems which are important for any flight to ISS.
After basic training and during pre-assignment training, astronauts will be requested to perform duties within the Directorate of Human and Robotic Exploration, e.g. supporting other astronauts during their missions by conducting ground control operations.
Only once an astronaut completes this phase of training they become eligible for assignment to a spaceflight.