| Acronym | Meaning |
 | PID | Program Introduction Document |
| RECS | Representative Shuttle Environmental Control System |
| INSTR | Instruct |
| CSIU | Core Segment Interface Unit |
| OTDA | Office Of Tracking And Data Acquisition (now OSTDS) |
| MVF | Manned Vertical Flight |
| SSI | Significant Structural Item |
| ETC | Estimate To Completion |
| EXTGH | Extinguish |
| PDP | Preliminary Definition Plan |
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