GAO examines the use of public funds; evaluates federal programs and policies; and provides analyses, recommendations, and other assistance to help Congress make informed oversight, policy, and funding decisions.
GAO's role in Congress oversight is critical to it's success. 
mnli hypothesis: GAO's role in Congress oversight is critical to it's success.  premise: GAO examines the use of public funds; evaluates federal programs and policies; and provides analyses, recommendations, and other assistance to help Congress make informed oversight, policy, and funding decisions.