I have been reading that many students have a PhD committee. I assume this is a group of experts supervising the student.
In my case, and I think this is quite common, I had two people. One was the principal supervisor and the other was the associate supervisor.
Almost all my contacts were with the principal supervisor. The associate supervisor was a back-up resource if and when needed.
This was a simple one-on-one contact between me and my principal supervisor.
I am just wondering how does a PhD committee work?