| Acronym | Meaning |
| VITT | Vehicle Integration Test Team |
| SIT | Shuttle Integrated Test |
| FS | Full Scale |
| DF | Development-Forward |
| CB | Constant Bandwidth |
| HAS | Hydraulic Actuation System |
| ERCA | Electrochemically Regenerable CO2Absorber |
| QPRD | Quality Planning Requirements Document |
| FHO | Failed Handover |
| SPIAP | Shuttle/Payload Integration Activities Plan |