GAO reports give lawmakers and the public a nonpartisan source of information about how tax dollars are being used.
The GAO is Congress's watchdog that checks how federal agencies spend taxpayer money and reports back on what's working and what isn't.
The agency estimates billions in potential savings each year by recommending changes to duplicative or inefficient federal programs.
GAO investigations are typically launched at the request of congressional committees or required by statute.
Staff review agency records, interview officials, and analyze data, then publish findings with recommendations for improvement.
The GAO tracks whether agencies implement its recommendations and reports back on compliance over time.