An analogue mission replicates part of the complexity of a real space mission, and it is carried out in locations where the environmental conditions are similar to the place the real mission will be done.
Analogue missions may be seen as a training scenario used by real astronauts and scientists. This is a well-established scientific way for building resilience and leadership, for example, or for testing a mission structure and corresponding procedures.
I had the chance to be involved in seven analogue missions so far, five of those in the leadership position from pre-mission training up to post-mission follow-up.
What does it take to become an astronaut? Discipline, consistency, daily willingness to learn and overcome failure, and understanding the importance of the crew.