| Term | Definition |
| Independent Agencies | Administer programs similar to those of the Cabinet departments (nearly 150) |
| Independent Executive Agencies | Include most of the independent agencies; do not have Cabinet status; not administrative and policy giants |
| Independent Regulatory Commissions | Largely beyond the reach of presidential direction and control; regulate important aspects of the nation's economy (10) |
| Quasi-Legislative and Quasi-Judicial Bodies | Congress has given them certain legislative-like and judicial-like powers |
| Government Corporations | Independent agencies within the executive branch and subject to the President's direction and control; set up by Congress to carry out certain business-like activities (over 50) |