; and (2) provide a clear process and mechanism for each agency to make timely revisions and updates. 3597. Independent evaluation (a) In general Not later than 2 years after the date of the enactment of this subchapter, and every 2 years thereafter, the Inspector General appointed under chapter 4 of title 5 for each agency shall perform an independent evaluation of the Federal artificial intelligence governance policies and practices of the agency and submit to the head of the agency, the Director, and the appropriate congressional committees, a report which may include a classified annex. The report shall include at a minimum— (1) an assessment of the comprehensive compliance of the agency with the requirement under section 3595 for each Federal artificial intelligence system in use or maintained by an agency to have an established, and appropriately noticed, AI governance charter, including timely revisions to reflect significant changes and appropriate use of the exemptions described under section 3595(e); and (2) an assessment of compliance by the agency with artificial intelligence governance policies and practices with the requirements of this subchapter. (b) Comptroller general The Comptroller General shall periodically evaluate and submit to Congress a report on the— (1) effectiveness of agency Federal artificial intelligence system governance policies and practices; (2) implementation of the requirements of this subchapter by the Director, Administrator, and agencies