The document summarizes the processing steps for the space shuttle Discovery before its launch. The external tank is delivered by barge and lifted vertically in the Vehicle Assembly Building (VAB). The solid rocket boosters and engines are then attached. Meanwhile, the payload is prepared in the Payload Preparation Room and then transported to the launch pad. The shuttle is attached to the external tank in the VAB before the entire assembly is transported to the launch pad on a crawler. Discovery then undergoes final preparations and is ready for launch.