The document summarizes the pre-launch processing steps for the space shuttle Discovery. The external tank arrives by barge and is lifted vertically in the VAB. The solid rocket boosters and engines are attached to the external tank. Then the shuttle is attached to the external tank in the VAB. Meanwhile, the payload is prepared in the Payload Preparation Room and then moved to the launch pad. Finally, the fully assembled shuttle and external tank are moved to the launch pad where the payload is inserted, making the shuttle ready for launch.