Correspondence issued by the Government Accountability Office with an abstract that begins "Since 1992, GAO has published long-term fiscal simulations of what might happen to federal deficits and debt levels under varying policy assumptions. We developed our long-term model in response to a bipartisan request from Members of Congress who were concerned about the long-term effects of fiscal policy. Our simulations were updated with Congressional Budget Office (CBO's) January budget and economic projections and continue to indicate that the long-term federal fiscal outlook remains unsustainable. This update combined with our analysis of the fiscal outlook of state and local governments demonstrates that the fiscal challenges facing all levels of government are linked and should be considered in a strategic and integrated manner. We update our simulations three times a year as new estimates become available from CBO's Budget and Economic Outlook (January), Social Security and Medicare Trustees Reports (spring), and CBO's Budget and Economic Outlook: An Update (late summer). This product responds to congressional interest in receiving updated simulation results."