Editing Core Rules (section)

===(GM) When to ask for a check ===
As Game master you ask for a check when a character is attempting to perform an action that has a chance of failure, would have narrative consequences, or an uncertain outcome. Choose a skill that you feel is most relevant to the the situation and how the character is trying to resolve it, and ask for a skill check for that skill. You may wish to give choices of multiple skills for the character to try to approach the problem in different ways. It is encouraged to allow players to negotiate using a different skill if they can convincingly explain how that skill will help the given situation, but ultimately the Game Master will have the final say in what skill the character will use.