| Table 1a - Accident Investigation Abbreviations |
| DOEA | Department of Energy Type "A" Accident Investigation |
| DOEB | Department of Energy Type "B" Accident Investigation |
| DOD | Department of Defense |
| DOT | Department of Transportation Accident Investigation |
| EPA | Environmental Protection Agency Accident Investigation |
| FAA | Federal Aviation Administration Accident Investigation |
| NASA | National Aeronautics and Space Administration Accident Investigation |
| NRC | Nuclear Regulatory Commission Accident Investigation |
| NSC | National Safety Council Accident Investigation |
| NTSB | National Transportation Safety Board Accident Investigation |
| OSHA | Occupational Safety and Health Administration Accident Investigation |
| SALG | State and Local Government Accident Investigation |