to determine whether the proposed outcomes have been achieved and how these metrics are measured. (4) A copy of the progress reports and the final reports relating to each social impact partnership project. (5) An estimate of the savings to the Federal, State, and local government, on a program-by-program basis and in the aggregate, resulting from the successful completion of the social impact partnership project. 2060. Regulations The Secretary, in consultation with the Federal Interagency Council on Social Impact Partnerships, may issue regulations as necessary to carry out this subtitle. 2061. GAO evaluation (a) In general Five years after the date of enactment of the Social Impact Partnerships to Pay for Results Act , the Comptroller General of the United States shall— (1) conduct an evaluation of the social impact partnership projects funded under this subtitle and, to the extent the Comptroller General determines necessary, of any other activities carried out with funds made available to carry out this subtitle