| B | Benefit |
| CFR | Code of Federal Regulations |
| EFR | Environmental Functional Review |
| EMP | Environmental Management Program |
| EMS | Environmental Management System |
| EO | Executive Order |
| EPA | Environmental Protection Agency |
| H | High (action priority category) |
| HQ | Headquarters |
| I | Impact |
| ISO | International Organization for Standardization |
| L | Low (action priority category) |
| L&R | Environmental Legal and Regulatory Implications; environmental consequence category |
| M | Medium (action priority category) |
| NCR | Natural and Cultural Resources Impacts (environmental consequence category) |
| NEPA | National Environmental Policy Act |
| NODIS | NASA Online Directives Information System |
| NPD | NASA Policy Directives |
| NPR | NASA Procedural Requirements |
| OSHA | Occupational, Safety, and Health Administration |
| R&S | Reputation and Stakeholder Relationships (environmental consequence category) |
| SATERN | System for Administration, Training, and Educational Resources for NASA |
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