In a magic system I'm working on, there are three "schools", sort of based on the old D6 Star Wars Force powers Control, Alter, and Sense (though they have different names in my system).
In my version, Control is exactly that, physical and mental control over a target, commanding a target to do something.
Alter is about changing the inherent properties of something, everything from temporary stat boosts to healing to shapeshifting to creating enchanted objects.
Magic is a lot less overt than in some games. No Fireball spell, for example. You can produce a similar effect by setting an object on fire, which is what my question is about.
I can't decide if setting a pile of wood (or whatever) on fire should fall under Control or Alter. Am I commanding the pile of wood to burn (Control), or am I changing the temperature of the pile of wood to bring it to the point where it burns (Alter).
Which "school" should this power fall under?