| Acronym | Meaning |
| HETM | Hybrid Engineering Test Model |
| WBSC | Wide-band Signal Conditioner |
| ORB | 1 -g Orbiter One-g (trainer) |
| CDU | Coupling Data Unit |
| FCCP | Firm Contract Cost ProPosal |
| MSM | Manned SupportModule |
| MED | Medical |
| SDD | System Design Document |
| PICRS | Program Information Control And Retrieval System |
| CCB | Configuration Change Board |