THE INTENT OF THIS ACQUISITION IS TO OBTAIN SCENARIOS DEVELOPMENT SUPPORT IN THE MODIFICATION AND SUBSEQUENT RUNNING OF AIR TRAFFIC CONTROL TOWER/AIRPORT SIMULATION SCENARIOS AND PERFORMANCE MEASUREMENT METHODOLOGY TO BE USED DURING HUMAN IN THE LOOP (HITL) EXPERIMENTS AT THREE AIR TRAFFIC CONTROL TOWERS. THESE EXPERIMENTS ARE BEING CONDUCTED BY FAA RESEARCHERS TO DETERMINE WHETHER CONTROLLERS IN AIR TRAFFIC CONTROL TOWERS USE A PARTICULAR SCANNING PATTERN WHEN PERFORMING CONTROL TASKS AT AIRPORTS, IF ANY SCAN PATTERNS LEAD TO IMPROVED SAFETY PERFORMANCE, AND WHETHER THE EFFECTIVE SCAN PATTERNS CAN BE TAUGHT TO NOVICE TOWER CONTROLLERS.