| OA | Office of the Administrator | |
| DDF | Director's Discretionary Fund | |
| OAT | Office of Aeronautics and Space Transportation Technology | |
| OES | Office of Earth Sciences | |
| OLMSA | Office of Life & Microgravity Sciences & Applications | |
| LS | Life Sciences | |
| UG | Microgravity Research | |
| OSF | Office of Space Flight | |
| OSS | Office of Space Science | |
| ATMS | Advanced Technology & Mission Studies | |
Definitions of Programs and Projects

Last updated June 18, 1999, by Nancy.L.Obryan@nasa.gov
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