| Acronym | Meaning |
 | IWG | Investigator Working Group |
 | ELV | Expendable Launch Vehicle |
 | TT | Terminal Timing |
 | SS | Subsystem |
 | MDD | Mate/Demate Device |
 | ISTF | Integrated System Test Flow |
 | OIA | Orbiter Interface Adapter |
 | G/G | Ground-to-Ground |
 | VSI | Video Simulation Interface |
 | PCT | Percent |