| Acronym | Meaning |
| DFRN | Differential |
| OS | Orbiter CEI Specification |
| S/W | Software |
| WAD | Work Authorization Document/Shop Order |
| QSMVT | Quarter Scale Model Vibration Testing |
| CTM | Crystalline Transitional Material |
| L | Length |
| IAD | Interface Agreement Document |
| V&V | Validation And Verification |
| SDT | Scaling And Display Task |