Spell schools were invented for Dragonlance in the lead up to the 2e era. The idea of an Illusionist is probably demonstrable enough outside of D&D, but the rest are pure TSR lore.
It can vary. At its best, it's a good way to share knowledge.
But even when it's useful, I find it incredibly draining. I can probably only do it for a few hours before I just stop being able to manage it.
"Performance Improvement Plan", It's a process for when an employee is believed to not be meeting expectations.
Depending on where you're at, it may actually be intended as a way to help you improve, or it may be the first step in being able to fire you without fear of being sued for wrongful termination. Lengthy documentation of underperformance is usually seen as the best defense in that sort of thing. I think a lot of people assume it's the latter.
Personally, I think that if a person can genuinely understand their underperformance, it could well be a genuine attempt at improvement. If only as a way to push someone to buckle down for fear of losing their job.
I've had friends who got put on PIPs in situations where they felt they were put onto tasks or projects which would have been difficult for anyone to accomplish with the resources they were given. In a few cases, it seems to come from the same few shitty managers.
In either case, it's probably not a bad idea to start mentally preparing yourself to move on.
So, like 18 months before this gets added to the Google graveyard?