GAO reviewed the Navy's efforts to implement and comply with the Federal Managers' Financial Integrity Act, focusing on: (1) the Navy's progress in implementing its program for evaluating internal controls; (2) whether actions taken by the Navy under the act are improving internal controls and accounting systems; and (3) the adequacy of the Navy's basis for determining that its accounting systems meet the act's requirements and conform with the Comptroller General's requirements for accounting systems. GAO found that the Navy made progress during 1984 in developing its internal controls evaluation program and in reviewing its accounting systems for compliance with the act. The Navy identified a number of material weaknesses for which corrective actions were underway or planned, at both departmental and local levels. However, GAO found that: (1) while the Navy has implemented a number of corrective actions, Navy managers do not routinely test corrective actions to determine their effectiveness; and (2) the Navy has not yet fully implemented its internal controls evaluation program or established a tracking system to ensure that identified material weaknesses are corrected. In addition, GAO found that: (1) most of the Navy's accounting systems do not conform with the Comptroller General's requirements; (2) the Navy did not adequately evaluate and test the systems it reported as being in conformance with the requirements; and (3) the Navy's efforts to bring its accounting systems into compliance could be delayed by schedule slippages for corrective actions, inadequate coordination of internal control reviews, and the lack of an adequate tracking system to monitor accounting system deficiencies and related corrective actions.