The Government Accountability Office (GAO) is the audit, evaluation, and investigative arm of Congress. It exists to support Congress in meeting its constitutional responsibilities and to improve the performance and enhance the accountability of the federal government for the benefit of the American people. As a legislative branch agency, GAO is exempt from many laws that apply to executive branch agencies. However, GAO generally holds itself to the requirements of many of the laws, including the Government Performance and Results Act (GPRA), as amended. GPRA requires that each agency must prepare an annual "performance plan covering each program activity set forth in the budget of such agency." This section of GAO's fiscal year 2017 budget request constitutes its performance plan. GAO is unique in its audit and evaluation capacity to support Congress by performing original research; providing technical assistance; and conducting analyses to help Congress make informed decisions across all segments of the federal budget, resulting in tangible results and enhanced oversight. GAO's work directly contributes to improvements in a broad array of federal programs affecting Americans everywhere. GAO demonstrated its core values of accountability, integrity, and reliability, by providing high-quality, high-value, and independent support to Congress in ways that generate material benefits to the nation. Given GAO's reputation for consistently producing high-quality work that is typically based on original research, it is not surprising that congressional demand for GAO products and services remains high. During fiscal year 2015, GAO received requests for work from 97 percent of the standing committees of the Congress and about 66 percent of their subcommittees.