Suppose you're reading/watching/telling a story or playing an RPG about people discovering they have unusual superpowers. What sort of questions would you want to be answered about the parameters of those superpowers?
Thinking about what it does, how powerful it is, what things it works on, what is immune to that power, what energy source it draws from, etc. What else?
I'm trying to come up with a big list of questions to be answered through the process of play, and need some more items.