Most often, standing committees that cover transportation-related issues are responsible for continuous review of the DOT. Standing committees or subcommittees also may be charged by legislative leadership to examine and review a specific topic during the interim, in preparation for the next legislative session. For example, a study on federal highway appropriations and state matching requirements was assigned to the North Dakota Transportation Committee during the 2005-2006 interim. In some cases, requests for interim studies may come from individual legislators.