What does the move reflect or model?

Think about what the move represents. In what circumstance does it apply? What questions does it (help) answer? What sort of conflict does it resolve? What fictional situation, trait, or ability does it model via rules? For example:

• "This move lets a PC see the future."
• "What happens when you're near a thunder drake as it bellows?"
• "If the PCs chase someone through Gordin's Delve, will they catch them?"
• "I'd like a more formal way to deal with resisting mind control."

You might find yourself writing the move's trigger as you do this. If you do, great, but it's just an idea right now. You might very well revise it as you go.