My guess since it is fairly personalized, is that discipline should probably be of the best benefit to the individual. Whatever is just and will best teach them would be employed but there are also rules that cover everyone so the child knows what to expect. I've never read up on that aspect, or, if I had, it was a long time ago.
From what I know of a few schools, there is a pretty strict orde in the classroom. I've never known anyone to be in trouble at one before.
Many homeschoolers use some of the methods for toddlers and young grades to keep them busy while they teach their older students.