Congressional oversight refers to the review, monitoring, and supervision of federal agencies, programs, activities, and policy implementation. Congress exercises this power largely through its standing committee system. However, oversight, which dates to the earliest days of the Republic, also occurs in a wide variety of congressional activities and contexts. These include authorization, appropriations, investigative, and legislative hearings by standing committees; specialized investigations by select committees; and reviews and studies by congressional support agencies and staff. Congress's oversight authority derives from its "implied" powers in the Constitution, public laws, and House and Senate rules. It is an integral part of the American system of checks and balances. Underlying the legislature's ability to oversee the executive branch are democratic principles as well as practical purposes. John Stuart Mill, the British Utilitarian philosopher, insisted that oversight was the key feature of a meaningful representative body: "The proper office of a representative assembly is to watch and control the government." As a young scholar and future President, Woodrow Wilson--in his 1885 treatise, Congressional Government --equated oversight with lawmaking, which was usually seen as the supreme function of a legislature. He wrote, "Quite as important as legislation is vigilant oversight of administration." The philosophical underpinning for oversight is the Constitution's system of checks and balances among the legislative, executive, and judicial branches. James Madison, known as the "Father of the Constitution," described the system in Federalist No. 51 as establishing "subordinate distributions of power, where the constant aim is to divide and arrange the several offices in such a manner that each may be a check on the other." Oversight, as an outgrowth of this principle, ideally serves a number of overlapping objectives and purposes: improve the efficiency, economy, and effectiveness of governmental operations; evaluate programs and performance; detect and prevent poor administration, waste, abuse, arbitrary and capricious behavior, or illegal and unconstitutional conduct; protect civil liberties and constitutional rights; inform the general public and ensure that executive policies reflect the public interest; gather information to develop new legislative proposals or to amend existing statutes; ensure administrative compliance with legislative intent; and prevent executive encroachment on legislative authority and prerogatives. In sum, oversight is a way for Congress to check on, and check, the executive branch. Although the Constitution grants no formal, express authority to oversee or investigate the executive or program administration, oversight is implied in Congress's impressive array of enumerated powers. The legislature is authorized to appropriate funds; raise and support armies; provide for and maintain a navy; declare war; provide for organizing and calling forth the national guard; regulate interstate and foreign commerce; establish post offices and post roads; advise and consent on treaties and presidential nominations (Senate); and impeach (House) and try (Senate) the President, Vice President, and civil officers for treason, bribery, or other high crimes and misdemeanors. Reinforcing these powers is Congress's broad authority "to make all laws which shall be necessary and proper for carrying into execution the foregoing powers, and all other powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof." The authority to oversee derives from these constitutional powers. Congress could not carry them out reasonably or responsibly without knowing what the executive is doing; how programs are being administered, by whom, and at what cost; and whether officials are obeying the law and complying with legislative intent. The Supreme Court has legitimated Congress's investigative power, subject to constitutional safeguards for civil liberties. In 1927, the Court found that, in investigating the administration of the Department of Justice, Congress was considering a subject "on which legislation could be had or would be materially aided by the information which the investigation was calculated to elicit." The "necessary and proper" clause of the Constitution also allows Congress to enact laws that mandate oversight by its committees, grant relevant authority to itself and its support agencies, and impose specific obligations on the executive to report to or consult with Congress, and even seek its approval for specific actions. Broad oversight mandates exist for the legislature in several significant statutes. The Legislative Reorganization Act of 1946 (P.L. 79-601), for the first time, explicitly called for "legislative oversight" in public law. It directed House and Senate standing committees "to exercise continuous watchfulness" over programs and agencies under their jurisdiction; authorized professional staff for them; and enhanced the powers of the Comptroller General, the head of Congress's investigative and audit arm, the Government Accountability Office (GAO). The Legislative Reorganization Act of 1970 (P.L. 91-510) authorized each standing committee to "review and study, on a continuing basis, the application, administration and execution" of laws under its jurisdiction; increased the professional staff of committees; expanded the assistance provided by the Congressional Research Service; and strengthened the program evaluation responsibilities of GAO. The Congressional Budget Act of 1974 ( P.L. 93 - 344 ) allowed committees to conduct program evaluation themselves or contract out for it; strengthened GAO's role in acquiring fiscal, budgetary, and program-related information; and upgraded GAO's review capabilities. Besides these general powers, numerous statutes direct the executive to furnish information to or consult with Congress. For example, the Government Performance and Results Act of 1993 ( P.L. 103 - 62 ) requires agencies to consult with Congress on their strategic plans and report annually on performance plans, goals, and results. In fact, more than 2,000 reports are submitted each year to Congress by federal departments, agencies, commissions, bureaus, and offices. Inspectors general (IGs), for instance, report their findings about waste, fraud, and abuse, and their recommendations for corrective action, periodically to the agency head and Congress. The IGs are also instructed to issue special reports concerning particularly serious and flagrant problems immediately to the agency head, who transmits them unaltered to Congress within seven days. Inspectors general also communicate with Members, committees, and staff of Congress in other ways, including testimony at hearings, in-person meetings, and written and electronic communications. The Reports Consolidation Act of 2000 ( P.L. 106 - 531 ), moreover, instructs the IGs to identify and describe their agencies' most serious management and performance challenges and briefly assess progress in addressing them. This new requirement is to be part of a larger effort by individual agencies to consolidate their numerous reports on financial and performance management matters into a single annual report. The aim is to enhance coordination and efficiency within the agencies; improve the quality of relevant information; and provide it in a more meaningful and useful format for Congress, the President, and the public. In addition to these avenues, Congress creates commissions and establishes task forces to study and make recommendations for select policy areas that can also involve examination of executive operations and organizations. There is a long history behind executive reports to Congress. Indeed, one of the first laws of the First Congress--the 1789 Act to establish the Treasury Department (1 Stat. 66)--called upon the Secretary and the Treasurer to report directly to Congress on public expenditures and all accounts. The Secretary was also required "to make report, and give information to either branch of the legislature ... respecting all matters referred to him by the Senate or House of Representatives, or which shall appertain to his office." Separate from such reporting obligations, public employees may provide information to Congress on their own. In the early part of the 20 th century, Congress enacted legislation to overturn a "gag" rule, issued by the President, that prohibited employees from communicating directly with Congress (5 U.S.C. 7211 (1994)). Other "whistleblower" statutes, which have been extended specifically to cover personnel in the intelligence community ( P.L. 105 - 272 ), guarantee the right of government employees to petition or furnish information to Congress or a Member. Chamber rules also reinforce the oversight function. House and Senate rules, for instance, provide for "special oversight" or comprehensive policy oversight, respectively, for specified committees over matters that relate to their authorizing jurisdiction. House rules also direct each standing committee to require its subcommittees to conduct oversight or to establish an oversight subcommittee for this purpose. House rules also call for each committee to submit an oversight agenda, listing its prospective oversight topics for the ensuing Congress, to the House Committee on Oversight and Government Reform, which reports the oversight plans to the House, and the Committee on House Administration. The House Oversight and Government Reform Committee and the Senate Homeland Security and Governmental Affairs Committee, which have oversight jurisdiction over virtually the entire federal government, furthermore, are authorized to review and study the operation of government activities to determine their economy and efficiency and to submit recommendations based on GAO reports to the House and the Senate, respectively. In addition, the House Oversight and Government Reform Committee may conduct an investigation of any matter. For any investigation it does conduct, the committee shall provide its findings and recommendations to any other standing committee that has jurisdiction over the matter. Oversight occurs through a wide variety of congressional activities and avenues. Some of the most publicized are the comparatively rare investigations by select committees into major scandals or into executive branch operations gone awry. Cases in point are temporary select committee inquiries into: Homeland Security matters following the terrorist attacks on September 11, 2001; China's acquisition of U.S. nuclear weapons information, in 1999; the Iran-Contra affair, in 1987; intelligence agency abuses, in 1975-1976, and "Watergate," in 1973-1974. The precedent for this kind of oversight actually goes back two centuries: in 1792, a special House committee investigated the ignominious defeat of an Army force by confederated Indian tribes. By comparison to these select panel investigations, other congressional inquiries in recent Congresses--into intelligence information and its sharing among federal agencies prior to the 9/11 attacks, U.S. intelligence about weapons of mass destruction before the invasion of Iraq, Whitewater, access to Federal Bureau of Investigation files, and campaign financing--have relied for the most part on standing committees. The impeachment proceedings against President Clinton in 1998 in the House and in 1999 in the Senate also generated considerable oversight. It not only encompassed the President and the White House staff, but also extended to the office of independent counsel, prompted by concerns about its authority, jurisdiction, and expenditures. Although such highly visible endeavors are significant, they usually reflect only a small portion of Congress's total oversight effort. More routine and regular review, monitoring, and supervision occur in other congressional activities and contexts. Especially important are appropriations hearings on agency budgets as well as authorization hearings for existing programs. Separately, examinations of executive operations and the implementation of programs--by congressional staff, support agencies, and specially created commissions and task forces--provide additional oversight. Senate Rule XXII, paragraph 2. U.S. Senate, Committee on Rules and Administration, Senate Manual, Containing the Standing Rules, Orders, Laws, and Resolutions Affecting the Business of the United States Senate , S.Doc. 110-1, 110 th Congress, 2 nd session, prepared by Matthew McGowan under the direction of Howard Gantman, Staff Director (Washington: GPO, 2008), sec. 22.2. Joel D. Aberbach, Keeping Watchful Eye: The Politics of Congressional Oversight (Washington: Brookings Institution, 1990). [author name scrubbed], "Congressional Oversight of the Presidency," Annals , vol. 499, Sept. 1988, pp. 75-89. David R. Mayhew, Divided We Govern: Party Control, Lawmaking, and Investigations, 1946-1990 (New Haven: Yale University Press, 1991). [author name scrubbed], "Legislative Oversight," Congressional Procedure and the Policy Process (Washington: Congressional Quarterly Press, 2005), pp. 274-297. Arthur M. Schlesinger and Roger Bruns, eds., Congress Investigates: A Documented History, 1792-1974 , 5 vols. (New York: Chelsea House Publishers, 1975). Charles Tiefer, "Congressional Oversight of the Clinton Administration and Congressional Procedure," Administrative Law Review, vol. 50, Winter 1998, pp. 199-216. U.S. Congress, House Committee on House Administration, "Oversight," History of the House of Representatives, 1789-1994 , H.Doc. 103-324, 103 rd Congress, 2 nd session (Washington: GPO, 1994), pp. 233-266. U.S. General Accounting Office, Investigators' Guide to Sources of Information, GAO Report OSI-97-2 (Washington: 1997). CRS Report RL30240, Congressional Oversight Manual , by [author name scrubbed] et al. CRS Report R41079, Congressional Oversight: An Overview , by [author name scrubbed] CRS Report RL32525, Congressional Oversight of Intelligence: Current Structure and Alternatives , by [author name scrubbed] and [author name scrubbed] CRS Video Series, Congressional Oversight (2004), dealing with tools and techniques, avenues and approaches, and authorities and assistance; on seven videos (MM70003-MM70009), available by calling [phone number scrubbed].

Summary:
Congressional oversight of policy implementation and administration has occurred throughout the history of the United States government under the Constitution. Oversight--the review, monitoring, and supervision of operations and activities--takes a variety of forms and utilizes various techniques. These range from specialized investigations by select committees to annual appropriations hearings, and from informal communications between Members or congressional staff and executive personnel to the use of extra-congressional mechanisms, such as offices of inspector general and study commissions. Oversight, moreover, is supported by a variety of authorities--the Constitution, public law, and chamber and committee rules--and is an integral part of the system of checks and balances between the legislative and executive branches. This report will be updated as events require.