Revised and translated version of this.
So, this sheet is meant to help fantasy world-builders (for any media, not just writing) create the magic systems for their worlds. It is inspired from some character sheets that ask you a series of questions. This sheet may be helpful for you at any stage of the worldbuilding process: whether you're just starting out and need ideas, or you're nearly done and want to make sure everything is consistent. Keep in mind that I'm not technically giving you ideas, just raising questions. This revised version puts more emphasis on definitions than the original.
So, let's start with the term "magic system". A system is a bunch of concepts that work together. Basically, I'll define a magic system as a set of laws for magic. If your world has several kinds of magic that have completely different possibilities (for instance, one kind of magic can do what is completely impossib