Readiness is a decision, not a feeling.

Before launch, teams compare the actual vehicle, crew, weather, ground systems and unresolved issues against agreed conditions for flight.

• Are critical systems ready?
• Are open anomalies understood?
• Does weather remain inside limits?
• Are crew and ground teams prepared?
• Should the mission GO, HOLD, recycle or stand down?

A delay can be a successful decision when it protects the mission from an unacceptable unknown.