Write predictions in advance

Why?

• Help conservation of expected evidence. Hard to conserve when you don't see the whole tree of possibilities, only one branch as it plays out.
• Blinding (same rationale as pre-registered research)
• Assure others that you did not do Texas sharpshooter, data-dredge etc.

What links here

• Ask people to guess before telling them a fact
• Conservation of Expected Evidence