The document provides a high-level overview of the shuttle processing steps before flight, including: 1) The external tank arrives by barge and is prepared in the Vertical Assembly Building. 2) Solid rocket boosters and engines are attached to the external tank. 3) The shuttle is attached to the external tank in the VAB. 4) Payloads are prepared in the Payload Preparation Room and moved to the launch pad. 5) The shuttle leaves the VAB on the crawler-transporter and arrives at the launch pad ready for launch.