Federal agency accounting systems are required to conform to the principles and standards prescribed by the Comptroller General. At September 30, 1980, 193 of the 301 accounting systems in the Federal Government has been approved. However, the unapproved systems account for the expenditures of more than half the Federal budget. In addition, many systems approved over a decade ago need to be reapproved. The growing demand for Government services accompanied by an emerging insistence on greater accountability focuses increased attention on accounting systems. GAO experience shows systems that meet the Comptroller General's requirements generally have fewer problems and permit more efficient and economical management. Congress should focus more attention on the importance of accounting systems by requiring the head of each agency requesting appropriations to report on the status of and progress made toward gaining GAO approval of its accounting systems. GAO reviews of accounting systems in operation are also summarized in this report. (Author).