Testimony issued by the Government Accountability Office with an abstract that begins "Recent terrorist events such as the attempted bomb attacks in New York's Times Square and aboard an airliner on Christmas Day 2009 are reminders that national security challenges have expanded beyond the traditional threats of the Cold War Era to include unconventional threats from nonstate actors. Today's threats are diffuse and ambiguous, making it difficult--if not impossible--for any single federal agency to address them alone. Effective collaboration among multiple agencies and across federal, state, and local governments is critical. This testimony highlights opportunities to strengthen interagency collaboration by focusing on four key areas: (1) developing overarching strategies, (2) creating collaborative organizations, (3) developing a well-trained workforce, and (4) improving information sharing. It is based on GAO's body of work on interagency collaboration."