Judith Orasanu, Bonny Parke, Norbert Kraft, Yuri Tada, Alan Hobbs, Barrett Anderson, Lori McDonnell, and Vicki Dulchinos, «Evaluating the Effectiveness of Schedule Changes for Air Traffic Service (ATS) Providers: Controller Alertness and Fatigue Monitoring Study,» DOT/FAA/HFD-13/001, December 2012, .