This may seem like an obvious one, but educational interactions tend to have a number of different roles associated with them. Consider that everything could bifurcate from the “autodidact”:
5. Tutor-Tutee #1-Tutee #2-Parent-Principal
etc., until we have bursars, librarians, technicians, janitors, editors of peer reviewed research journals, government policy makers, spin-off industrial ventures and partnerships, etc., all involved in Education.
Even the autodidact may assume different roles at different points in time – sometimes making a library run, sometimes constructing a model, sometimes checking a proof. The decomposition of “learning” into different phases or polarities could be an endless theoretical task. For the moment, we just note that roles are often present “by default” at the start of a learning process, and that they may change as the process develops.